1. K.H.J. Buschow, in: K.H.J. Buschow (Ed.), Handbook of Magnetic Materials, Vol. 10, Elsevier Science, North Holland, Amsterdam, 1997 (Chapter 4).
2. The microstructural and compositional influence upon HIREM behavior in Nd2Fe14B
3. The exchange-spring magnet: a new material principle for permanent magnets
4. K.H. Müller, D. Eckert, A. Handstein, M. Wolf, S. Wirth, L.L.M. Martinez, Proceedings of the Eighth International Symposium Magn. Anisotropy and Coercivity in RE-TM Alloys, Birmingham, UK, 1994, p. 179.