%0 Journal Article %A L. A. Molotkov %T On the derivation methods of the equations describing the effective models of layered media %J Zapiski Nauchnykh Seminarov POMI %D 1998 %P 219-243 %V 250 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1998_250_a14/ %G ru %F ZNSL_1998_250_a14