Difusivitas termal: Perbedaan antara revisi
Wagino Bot (bicara | kontrib) k →top: minor cosmetic change |
k Robot: Perubahan kosmetika |
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Baris 27: | Baris 27: | ||
| [[Emas]] || 1.27 × 10<sup>−4</sup> <ref name="eleccool">{{cite journal|url=http://www.electronics-cooling.com/2007/08/thermal-diffusivity/ |title=Materials Data| author= Jim Wilson | date= August 2007 }}</ref> || 127 |
| [[Emas]] || 1.27 × 10<sup>−4</sup> <ref name="eleccool">{{cite journal|url=http://www.electronics-cooling.com/2007/08/thermal-diffusivity/ |title=Materials Data| author= Jim Wilson | date= August 2007 }}</ref> || 127 |
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| [[Tembaga]] at 25°C || 1.11 × 10<sup>−4</sup> <ref |
| [[Tembaga]] at 25 °C || 1.11 × 10<sup>−4</sup> <ref name="Casalegno2010">{{cite journal|url= http://www.sciencedirect.com/science/article/pii/S0022311510005337 |title= Measurement of thermal properties of a ceramic/metal joint by laser flash method |volume=407 |issue=2|page=83 | author= V. Casalegno, P. Vavassori, M. Valle, M. Ferraris, M. Salvo, G. Pintsuk| year= 2010 |doi=10.1016/j.jnucmat.2010.09.032|bibcode = 2010JNuM..407...83C }}</ref> || 111 |
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| [[Aluminium]] || 8.418 × 10<sup>−5</sup> || 84.18 |
| [[Aluminium]] || 8.418 × 10<sup>−5</sup> || 84.18 |
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| Al-10Si-Mn-Mg (Silafont 36) at 20°C || 74.2 × 10<sup>−6</sup> <ref>{{cite journal |author= P. Hofer, E. Kaschnitz | title= Thermal diffusivity of the aluminium alloy Al-10Si-Mn-Mg (Silafont 36) in the solid and liquid states |journal= High Temperatures-High Pressures | volume=40 |issue=3-4 |page=311 | year= 2011|url= http://www.oldcitypublishing.com/HTHP/HTHPcontents/HTHP40.3-4contents.html }}</ref> || 74.2 |
| Al-10Si-Mn-Mg (Silafont 36) at 20 °C || 74.2 × 10<sup>−6</sup> <ref>{{cite journal |author= P. Hofer, E. Kaschnitz | title= Thermal diffusivity of the aluminium alloy Al-10Si-Mn-Mg (Silafont 36) in the solid and liquid states |journal= High Temperatures-High Pressures | volume=40 |issue=3-4 |page=311 | year= 2011|url= http://www.oldcitypublishing.com/HTHP/HTHPcontents/HTHP40.3-4contents.html }}</ref> || 74.2 |
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| Aluminum paduan 6061-T6 || 6.4 × 10<sup>−5</sup> <ref name="eleccool"/> || 64 |
| Aluminum paduan 6061-T6 || 6.4 × 10<sup>−5</sup> <ref name="eleccool"/> || 64 |
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| Al-5Mg-2Si-Mn (Magsimal-59) at 20°C || 44.0 × 10<sup>−6</sup> <ref>{{cite journal |author= E. Kaschnitz, M. Küblböck|title=Thermal diffusivity of the aluminium alloy Al-5Mg-2Si-Mn (Magsimal-59) in the solid and liquid states|journal=High Temperatures-High Pressures |volume= 37 |issue=3 |page= 221 | year= 2008 |url= http://www.oldcitypublishing.com/HTHP/HTHPcontents/HTHP37.3contents.html }}</ref> || 44.0 |
| Al-5Mg-2Si-Mn (Magsimal-59) at 20 °C || 44.0 × 10<sup>−6</sup> <ref>{{cite journal |author= E. Kaschnitz, M. Küblböck|title=Thermal diffusivity of the aluminium alloy Al-5Mg-2Si-Mn (Magsimal-59) in the solid and liquid states|journal=High Temperatures-High Pressures |volume= 37 |issue=3 |page= 221 | year= 2008 |url= http://www.oldcitypublishing.com/HTHP/HTHPcontents/HTHP37.3contents.html }}</ref> || 44.0 |
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| [[Baja]], 1% carbon || 1.172 × 10<sup>−5</sup> || 11.72 |
| [[Baja]], 1% carbon || 1.172 × 10<sup>−5</sup> || 11.72 |
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| [[Baja tahan karat]] 304A at 27°C || 4.2 × 10<sup>−6</sup> <ref name="eleccool"/> || 4.2 |
| [[Baja tahan karat]] 304A at 27 °C || 4.2 × 10<sup>−6</sup> <ref name="eleccool"/> || 4.2 |
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| [[Baja tahan karat]] 310 at 25°C || 3.352 × 10<sup>−6</sup> <ref>{{cite journal |author=J. Blumm, A. Lindemann, B. Niedrig, R. Campbell |title=Measurement of Selected Thermophysical Properties of the NPL Certified Reference Material Stainless Steel 310 |journal=International Journal of Thermophysics |volume=28 |page=674 |year=2007 |doi= 10.1007/s10765-007-0177-z |url= http://www.springerlink.com/content/4kl8p6717705h766/ |issue=2 |bibcode = 2007IJT....28..674B }}</ref> || 3.352 |
| [[Baja tahan karat]] 310 at 25 °C || 3.352 × 10<sup>−6</sup> <ref>{{cite journal |author=J. Blumm, A. Lindemann, B. Niedrig, R. Campbell |title=Measurement of Selected Thermophysical Properties of the NPL Certified Reference Material Stainless Steel 310 |journal=International Journal of Thermophysics |volume=28 |page=674 |year=2007 |doi= 10.1007/s10765-007-0177-z |url= http://www.springerlink.com/content/4kl8p6717705h766/ |issue=2 |bibcode = 2007IJT....28..674B }}</ref> || 3.352 |
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| [[Inconel 600]] at 25°C || 3.428 × 10<sup>−6</sup> <ref>{{cite journal |author= J. Blumm , A. Lindemann, B. Niedrig |title= Measurement of the thermophysical properties of an NPL thermal conductivity standard Inconel 600|journal= High Temperatures-High Pressures |volume=35/36 |issue=6 |page=621 | year= 2003/2007 |url=http://www.perceptionweb.com/abstract.cgi?id=htjr145 }}</ref> || 3.428 |
| [[Inconel 600]] at 25 °C || 3.428 × 10<sup>−6</sup> <ref>{{cite journal |author= J. Blumm , A. Lindemann, B. Niedrig |title= Measurement of the thermophysical properties of an NPL thermal conductivity standard Inconel 600|journal= High Temperatures-High Pressures |volume=35/36 |issue=6 |page=621 | year= 2003/2007 |url=http://www.perceptionweb.com/abstract.cgi?id=htjr145 }}</ref> || 3.428 |
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| [[Molybdenum]] (99.95%) at 25°C || 54.3 × 10<sup>−6</sup> <ref>{{cite conference|conference=17th [[PLANSEE|Plansee]] Seminar |title= Measurement of the Thermophysical Properties of Pure Molybdenum | author= A. Lindemann, J. Blumm | year= 2009 |volume=3 }}</ref> || 54.3 |
| [[Molybdenum]] (99.95%) at 25 °C || 54.3 × 10<sup>−6</sup> <ref>{{cite conference|conference=17th [[PLANSEE|Plansee]] Seminar |title= Measurement of the Thermophysical Properties of Pure Molybdenum | author= A. Lindemann, J. Blumm | year= 2009 |volume=3 }}</ref> || 54.3 |
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| [[Besi]] || 2.3 × 10<sup>−5</sup> <ref name="eleccool"/> || 23 |
| [[Besi]] || 2.3 × 10<sup>−5</sup> <ref name="eleccool"/> || 23 |
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Baris 53: | Baris 53: | ||
| [[Quartz]] || 1.4 × 10<sup>−6</sup> <ref name="eleccool"/> || 1.4 |
| [[Quartz]] || 1.4 × 10<sup>−6</sup> <ref name="eleccool"/> || 1.4 |
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| Komposit karbon pada 25°C || 216.5 × 10<sup>−6</sup> <ref |
| Komposit karbon pada 25 °C || 216.5 × 10<sup>−6</sup> <ref name=" Casalegno2010" /> || 216.5 |
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| [[Aluminium oksida]] (polikristalin) || 1.20 × 10<sup>−5</sup> || 12.0 |
| [[Aluminium oksida]] (polikristalin) || 1.20 × 10<sup>−5</sup> || 12.0 |
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Baris 59: | Baris 59: | ||
| [[Silikon dioksida]] (polikristalin) || 8.3 × 10<sup>−7</sup> <ref name="eleccool"/> || 0.83 |
| [[Silikon dioksida]] (polikristalin) || 8.3 × 10<sup>−7</sup> <ref name="eleccool"/> || 0.83 |
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| Si<sub>3</sub> N<sub>4</sub> dengan [[carbon nanotube|CNTs]] 26°C || 9.142 × 10<sup>−6</sup> <ref |
| Si<sub>3</sub> N<sub>4</sub> dengan [[carbon nanotube|CNTs]] 26 °C || 9.142 × 10<sup>−6</sup> <ref name="Koszor2009">{{cite journal |journal=Key Engineering Materials|url= http://www.scientific.net/KEM.409.354 |title= Observation of thermophysical and tribological properties of CNT reinforced Si<sub>3</sub> N<sub>4</sub> |volume=409 |page=354 | author= O. Koszor, A. Lindemann, F. Davin, C. Balázsi| year= 2009 |doi= 10.4028/www.scientific.net/KEM.409.354 }}</ref> || 9.142 |
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| Si<sub>3</sub> N<sub>4</sub> tanpa [[carbon nanotube|CNTs]] 26°C || 8.605 × 10<sup>−6</sup> <ref |
| Si<sub>3</sub> N<sub>4</sub> tanpa [[carbon nanotube|CNTs]] 26 °C || 8.605 × 10<sup>−6</sup> <ref name=" Koszor2009" /> || 8.605 |
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| [[Polikarbonat]] pada 25°C || 0.144 × 10<sup>−6</sup> <ref |
| [[Polikarbonat]] pada 25 °C || 0.144 × 10<sup>−6</sup> <ref name="HTHP3536pp627">{{cite journal |author= J. Blumm, A. Lindemann |title= Characterization of the thermophysical properties of molten polymers and liquids using the flash technique |journal=High Temperatures-High Pressures |volume= 35/36 |issue=6 |page= 627 | year= 2003/2007 |doi= 10.1068/htjr144 }}</ref> || 0.144 |
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| [[Polipropilena]] pada 25°C || 0.096 × 10<sup>−6</sup> <ref |
| [[Polipropilena]] pada 25 °C || 0.096 × 10<sup>−6</sup> <ref name="HTHP3536pp627"/> || 0.096 |
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| [[Parafin]] pada 25°C || 0.081 × 10<sup>−6</sup> <ref |
| [[Parafin]] pada 25 °C || 0.081 × 10<sup>−6</sup> <ref name="HTHP3536pp627"/> || 0.081 |
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| [[PVC]] || 8 × 10<sup>−8</sup> <ref name="eleccool"/> || 0.08 |
| [[PVC]] || 8 × 10<sup>−8</sup> <ref name="eleccool"/> || 0.08 |
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| [[PTFE]] pada 25°C|| 0.124 × 10<sup>−6</sup> <ref>{{cite journal |author= J. Blumm, A. Lindemann, M. Meyer, C. Strasser | title= Characterization of PTFE Using Advanced Thermal Analysis Technique |journal= International Journal of Thermophysics| volume=40 |issue=3-4 |page=311 | year= 2011|doi= 10.1007/s10765-008-0512-z |bibcode = 2010IJT....31.1919B }}</ref> || 0.124 |
| [[PTFE]] pada 25 °C|| 0.124 × 10<sup>−6</sup> <ref>{{cite journal |author= J. Blumm, A. Lindemann, M. Meyer, C. Strasser | title= Characterization of PTFE Using Advanced Thermal Analysis Technique |journal= International Journal of Thermophysics| volume=40 |issue=3-4 |page=311 | year= 2011|doi= 10.1007/s10765-008-0512-z |bibcode = 2010IJT....31.1919B }}</ref> || 0.124 |
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| [[Air]] at 25°C || 0.143 × 10<sup>−6</sup> <ref |
| [[Air]] at 25 °C || 0.143 × 10<sup>−6</sup> <ref name="HTHP3536pp627"/> || 0.143 |
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| [[Alkohol]] || 7 × 10<sup>−8</sup> <ref name="eleccool"/> || 0.07 |
| [[Alkohol]] || 7 × 10<sup>−8</sup> <ref name="eleccool"/> || 0.07 |
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Baris 99: | Baris 99: | ||
| [[Kayu]] (Pinus Kuning) || 8.2 × 10<sup>−8</sup> || 0.082 |
| [[Kayu]] (Pinus Kuning) || 8.2 × 10<sup>−8</sup> || 0.082 |
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| [[Pelumas]] [[mesin]] (jenuh 100 |
| [[Pelumas]] [[mesin]] (jenuh 100 °C) || 7.38 × 10<sup>−8</sup> || 0.0738 |
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Baris 108: | Baris 108: | ||
* [[Konstanta waktu termal]] |
* [[Konstanta waktu termal]] |
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==Referensi== |
== Referensi == |
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{{Reflist}} |
{{Reflist}} |
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Revisi per 5 Oktober 2016 14.05
Dalam analisis perpindahan panas, Difusivitas termal adalah konduktivitas termal dibagi dengan massa jenis dan panas jenis pada tekanan yang konstan. Difusivitas termal mengukur kemampuan material untuk mengonduksi energi panas relatif terhadap kemampuannya untuk menyimpan energi panas. Difusivitas termal memakai lambang α namun a, κ,[1] K,[2] dan D juga digunakan. Satuan SI yang digunakan adalah m²/s. Difusivitas termal dirumuskan dengan:
di mana
- adalah konduktivitas termal (W/(m·K))
- adalah densitas (kg/m³)
- adalah panas jenis (J/(kg·K))
dapat disebut sebagai kapasitas panas volumetrik (J/(m³·K)).
Seperti dilihat pada persamaan panas,[3]
- ,
difusivitas termal adalah rasio turunan waktu terhadap temperatur pada turunan keduanya. Difusivitas termal dapat disebut juga sebagai ukuran dari inersia termal.[4] Dalam zat dengan difusivitas termal yang tinggi, panas bergerak cepat karena zat tersebut menghantarkan panas relatif terhadap kapasitas panas volumetriknya.
Bahan | Difusivitas termal (m²/s) |
Difusivitas termal (mm²/s) |
---|---|---|
Karbon pirolitik, sejajar dengan lapisan | 1.22 × 10−3 | 1220 |
Perak (99.9%) | 1.6563 × 10−4 | 165.63 |
Emas | 1.27 × 10−4 [7] | 127 |
Tembaga at 25 °C | 1.11 × 10−4 [8] | 111 |
Aluminium | 8.418 × 10−5 | 84.18 |
Al-10Si-Mn-Mg (Silafont 36) at 20 °C | 74.2 × 10−6 [9] | 74.2 |
Aluminum paduan 6061-T6 | 6.4 × 10−5 [7] | 64 |
Al-5Mg-2Si-Mn (Magsimal-59) at 20 °C | 44.0 × 10−6 [10] | 44.0 |
Baja, 1% carbon | 1.172 × 10−5 | 11.72 |
Baja tahan karat 304A at 27 °C | 4.2 × 10−6 [7] | 4.2 |
Baja tahan karat 310 at 25 °C | 3.352 × 10−6 [11] | 3.352 |
Inconel 600 at 25 °C | 3.428 × 10−6 [12] | 3.428 |
Molybdenum (99.95%) at 25 °C | 54.3 × 10−6 [13] | 54.3 |
Besi | 2.3 × 10−5 [7] | 23 |
Silikon | 8.8 × 10−5 [7] | 88 |
Quartz | 1.4 × 10−6 [7] | 1.4 |
Komposit karbon pada 25 °C | 216.5 × 10−6 [8] | 216.5 |
Aluminium oksida (polikristalin) | 1.20 × 10−5 | 12.0 |
Silikon dioksida (polikristalin) | 8.3 × 10−7 [7] | 0.83 |
Si3 N4 dengan CNTs 26 °C | 9.142 × 10−6 [14] | 9.142 |
Si3 N4 tanpa CNTs 26 °C | 8.605 × 10−6 [14] | 8.605 |
Polikarbonat pada 25 °C | 0.144 × 10−6 [15] | 0.144 |
Polipropilena pada 25 °C | 0.096 × 10−6 [15] | 0.096 |
Parafin pada 25 °C | 0.081 × 10−6 [15] | 0.081 |
PVC | 8 × 10−8 [7] | 0.08 |
PTFE pada 25 °C | 0.124 × 10−6 [16] | 0.124 |
Air at 25 °C | 0.143 × 10−6 [15] | 0.143 |
Alkohol | 7 × 10−8 [7] | 0.07 |
Uap air (1 atm, 400 K) | 2.338 × 10−5 | 23.38 |
Udara (300 K) | 1.9 × 10−5 [7] | 19 |
Argon (300 K, 1 atm) | 2,2×10−5[17] | 22 |
Helium (300 K, 1 atm) | 1,9×10−4[17] | 190 |
Hidrogen (300 K, 1 atm) | 1,6×10−4[17] | 160 |
Nitrogen (300 K, 1 atm) | 2,2×10−5[17] | 22 |
Timah | 4.0 × 10−5 [7] | 40 |
Kaca jendela | 3.4 × 10−7 | 0.34 |
Karet | 1.3 × 10−7[butuh rujukan] || 0.13 | |
Nilon | 9 × 10−8 | 0.09 |
Kayu (Pinus Kuning) | 8.2 × 10−8 | 0.082 |
Pelumas mesin (jenuh 100 °C) | 7.38 × 10−8 | 0.0738 |
Lihat pula
Referensi
- ^ Gladwell, Richard B. Hetnarski, M. Reza Eslami ; edited by G.M.L. (2009). Thermal Stresses - Advanced Theory and Applications (edisi ke-Online-Ausg.). Dordrecht: Springer Netherlands. hlm. 170. ISBN 978-1-4020-9247-3.
- ^ Unsworth, J.; Duarte, F. J. (1979), "Heat diffusion in a solid sphere and Fourier Theory", Am. J. Phys., 47 (11): 891–893, Bibcode:1979AmJPh..47..981U, doi:10.1119/1.11601
- ^ Carslaw, H. S.; Jaeger, J. C. (1959), Conduction of Heat in Solids (edisi ke-2nd), Oxford University Press, ISBN 978-0-19-853368-9
- ^ Venkanna, B.K. (2010). Fundamentals of Heat and Mass Transfer. New Delhi: PHI Learning. hlm. 38. ISBN 978-81-203-4031-2. Diakses tanggal 1 December 2011.
- ^ Brown; Marco (1958). Introduction to Heat Transfer (edisi ke-3rd). McGraw-Hill.
- ^ Eckert; Drake (1959). Heat and Mass Transfer. McGraw-Hill. ISBN 0-89116-553-3. cited in Holman, J.P. (2002). Heat Transfer (edisi ke-9th). McGraw-Hill. ISBN 0-07-029639-1.
- ^ a b c d e f g h i j k Jim Wilson (August 2007). "Materials Data".
- ^ a b V. Casalegno, P. Vavassori, M. Valle, M. Ferraris, M. Salvo, G. Pintsuk (2010). "Measurement of thermal properties of a ceramic/metal joint by laser flash method". 407 (2): 83. Bibcode:2010JNuM..407...83C. doi:10.1016/j.jnucmat.2010.09.032.
- ^ P. Hofer, E. Kaschnitz (2011). "Thermal diffusivity of the aluminium alloy Al-10Si-Mn-Mg (Silafont 36) in the solid and liquid states". High Temperatures-High Pressures. 40 (3-4): 311.
- ^ E. Kaschnitz, M. Küblböck (2008). "Thermal diffusivity of the aluminium alloy Al-5Mg-2Si-Mn (Magsimal-59) in the solid and liquid states". High Temperatures-High Pressures. 37 (3): 221.
- ^ J. Blumm, A. Lindemann, B. Niedrig, R. Campbell (2007). "Measurement of Selected Thermophysical Properties of the NPL Certified Reference Material Stainless Steel 310". International Journal of Thermophysics. 28 (2): 674. Bibcode:2007IJT....28..674B. doi:10.1007/s10765-007-0177-z.
- ^ J. Blumm , A. Lindemann, B. Niedrig (2003/2007). "Measurement of the thermophysical properties of an NPL thermal conductivity standard Inconel 600". High Temperatures-High Pressures. 35/36 (6): 621.
- ^ A. Lindemann, J. Blumm (2009). Measurement of the Thermophysical Properties of Pure Molybdenum. 17th Plansee Seminar. 3.
- ^ a b O. Koszor, A. Lindemann, F. Davin, C. Balázsi (2009). "Observation of thermophysical and tribological properties of CNT reinforced Si3 N4". Key Engineering Materials. 409: 354. doi:10.4028/www.scientific.net/KEM.409.354.
- ^ a b c d J. Blumm, A. Lindemann (2003/2007). "Characterization of the thermophysical properties of molten polymers and liquids using the flash technique". High Temperatures-High Pressures. 35/36 (6): 627. doi:10.1068/htjr144.
- ^ J. Blumm, A. Lindemann, M. Meyer, C. Strasser (2011). "Characterization of PTFE Using Advanced Thermal Analysis Technique". International Journal of Thermophysics. 40 (3-4): 311. Bibcode:2010IJT....31.1919B. doi:10.1007/s10765-008-0512-z.
- ^ a b c d Lide, David R., ed. (1992). CDC Handbook of Chemistry and Physics (edisi ke-71st). Boston: Chemical Rubber Publishing Company. cited in Baierlein, Ralph (1999). Thermal Physics. Cambridge, UK: Cambridge University Press. hlm. 372. ISBN 0-521-59082-5. Diakses tanggal 1 December 2011.