1. |
S. E. Karpovich, L. G. Krasnevsky, N. A. Izobov, E. A. Barabanov, “On integrals of three-dimensional linear differential systems with skew-symmetric coefficient matrices”, Differ. Uravn., 42:8 (2006), 1027–1034 ; Differ. Equ., 42:8 (2006), 1086–1094 |