%0 Journal Article %A P. I. Plotnikov %T Spatial potential flows with free boundary %J Doklady Akademii Nauk %D 1975 %P 1287-1289 %V 224 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1975_224_6_a12/ %G ru %F DAN_1975_224_6_a12