%0 Journal Article %A A. S. Sorokin %T The G.~M.~Goluzin--P.~P.~Kufarev variational method and the M.~V.~Keldysh--L.~I.~Sedov formula %J Doklady Akademii Nauk %D 1989 %P 273-277 %V 308 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1989_308_2_a2/ %G ru %F DAN_1989_308_2_a2