%0 Journal Article %A O. S. Eritsyan %A M. A. Ganapetian %T The open surface of wave vectors in ferromagnetic media %J Proceedings of the Yerevan State University. Physical and mathematical sciences %D 1986 %P 146-148 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZERU_1986_1_a15/ %G ru %F UZERU_1986_1_a15