1. van Schilfgaarde, M., Abrikosov, I. A. & Johansson, B. Nature 400, 46–49 (1999).
2. Guillaume, C. E. C. R. Acad. Sci. 125, 235–238 (1897).
3. Wassermann, E. F. in The Invar Effect: Centennial Symposium (ed. Wittenauer, J.) 51 (Minerals, Metals & Materials Society, 1997).
4. Weiss, R. Proc. R. Soc. Lond. 82, 281–288 (1963).