%0 Journal Article %A T. M. Popova %T The higher approximations for the eigen oscillations of the flat multimirrors resonator %J Zapiski Nauchnykh Seminarov POMI %D 1969 %P 142-153 %V 15 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1969_15_a8/ %G ru %F ZNSL_1969_15_a8