J. Fidler, D. Süss, T. Schrefl:
"Rare earth intermetallics for permanent magnet applications";
in: "Handbook of Magnetism and Advanced Magnetic Materials", H. Kronmüller, S. Parkin (Hrg.); WILEY-VCH Verlag, Amsterdam, 2007, ISBN: 0-470-02217-5, S. 1945 - 1968.
Vol. 4 (Novel Materials)
http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470022175.html