1. Klein, H.P., Menth, A., Perkins, R.S.: Physica 80B (1975) 153.
2. Maeda, H.: Phys. Status Solidi A 45 (1978) 445.
3. Kirchmayer, H.R., Burzo, E.: Compounds of Rare Earth Elements and 3d Elements, Landolt- Börnstein: Numerical Data and Functional Relationship in Science and Technology - New Series, Vol. III/19d2, Heidelberg: Springer Verlag, 1990.
4. Fuji, H., Sun, H.: Interstitially Modified Intermetallics of Rare Earth and 3d Elements, in: Buschow, K.H.J. (Ed.): Handbook of Magnetic Materials, Vol. 9, Chap. 3, North-Holland: Elsevier, 1995.
5. Skomski, R., Sellmyer, D.J.: J. Rare Earths 27 (2009) 675.