%0 Journal Article
%A V. S. Malakhovskii
%T On a class of congruences of second-order curves with a degenerate focal surface
%J Doklady Akademii Nauk
%D 1962
%P 765-766
%V 146
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a6/
%G ru
%F DAN_1962_146_4_a6