%0 Journal Article %A È. M. Belenov %A A. N. Oraevsky %T Radiation conditions of a gas laser with annular cavity %J Doklady Akademii Nauk %D 1968 %P 56-58 %V 180 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1968_180_1_a14/ %G ru %F DAN_1968_180_1_a14