%0 Journal Article %A Sinkha S. R. P. %T Rigorous theory of steady waves at a free surface and the surface of separation between two liquids %J Doklady Akademii Nauk %D 1966 %P 47-50 %V 168 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1966_168_1_a10/ %G ru %F DAN_1966_168_1_a10