%0 Journal Article %A È. R. Rozendorn %T The isolated singular point on a surface with regular metric and negative curvature %J Doklady Akademii Nauk %D 1963 %P 780-783 %V 149 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_149_4_a6/ %G ru %F DAN_1963_149_4_a6