%0 Journal Article %A Ya. V. Kurylev %T ``Quasiphoton'' In active media %J Zapiski Nauchnykh Seminarov POMI %D 1985 %P 104-115 %V 148 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a10/ %G ru %F ZNSL_1985_148_a10