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Ananthanarayanan, N. I.; Peavler, R. J. (1961). «A New Reversible Solid-State Transformation in Iron–Nickel Alloys in the Invar Range of Compositions». Nature192 (4806): 962-963. Bibcode:1961Natur.192..962A. S2CID4277440. doi:10.1038/192962a0.
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«Nickel & Its Uses». Nickel Magazine. Nickel Institute. 3 de mayo de 2005. Archivado desde el original el 19 de diciembre de 2010. Consultado el 20 de marzo de 2011.
«The Nobel Prize in Physics 1920». nobelprize.org. The Nobel Foundation. Consultado el 20 de marzo de 2011. «The Nobel Prize in Physics 1920 was awarded to Charles Edouard Guillaume "in recognition of the service he has rendered to precision measurements in Physics by his discovery of anomalies in nickel steel alloys".»
Ananthanarayanan, N. I.; Peavler, R. J. (1961). «A New Reversible Solid-State Transformation in Iron–Nickel Alloys in the Invar Range of Compositions». Nature192 (4806): 962-963. Bibcode:1961Natur.192..962A. S2CID4277440. doi:10.1038/192962a0.
«Nickel & Its Uses». Nickel Magazine. Nickel Institute. 3 de mayo de 2005. Archivado desde el original el 19 de diciembre de 2010. Consultado el 20 de marzo de 2011.