Pobell, F. (2007). Matter and Methods at Low Temperatures (3rd ed.). Springer. ISBN 978-3-540-46356-6. 978-3-540-46356-6
"The Provisional Low Temperature Scale from 0.9 mK to 1 K, PLTS-2000" (PDF). International Bureau of Weights and Measures. Retrieved December 11, 2013. http://www.bipm.org/utils/en/pdf/PLTS-2000.pdf
"Supplementary Information for the ITS-90". International Bureau of Weights and Measures. Archived from the original on 2012-09-10. Retrieved December 11, 2013. https://web.archive.org/web/20120910075232/http://www.bipm.org/en/publications/mep_kelvin/its-90_supplementary.html