%0 Journal Article %A Yu. A. Semenov %T An equation for the product of semigroups defined by the method of bilinear forms and its application to the Schr\"odinger equation %J Doklady Akademii Nauk %D 1972 %P 1024-1026 %V 203 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a13/ %G ru %F DAN_1972_203_5_a13