1. in: Ferromagnetic Materials, Handbook on the Properties of Magnetically Ordered Substances, Vol. 1, Chapt. 7, Ed. North-Holland Publ. Co., Amsterdam 1980 (p. 531).
2. , , and , Fiz. Metallov i Metallovedenie No. 2, 92 (1990).
3. , , , , and , in: The Rare Earths in Modern Science and Technology, Proc. 10th Rare Earth Conf., 1973 (p. 605).
4. , , and , in: Orientation Transition in the Rare Earth Magnetics, Izd. Nauka, Moscow 1979 (in Russian).