@article{MM_1990_2_9_a11,
     author = {N. N. Elkin},
     title = {Effect of lifting of mode degeneracy in unstable optical resonator under influence of active medium},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {133--144},
     publisher = {mathdoc},
     volume = {2},
     number = {9},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1990_2_9_a11/}
}