%0 Journal Article %A N. N. Elkin %T Effect of lifting of mode degeneracy in unstable optical resonator under influence of active medium %J Matematičeskoe modelirovanie %D 1990 %P 133-144 %V 2 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM_1990_2_9_a11/ %G ru %F MM_1990_2_9_a11