%0 Journal Article
%A A. I. Degtyarev
%T Classification of surfaces of degree four having a~nonsimple singular point
%J Izvestiya. Mathematics 
%D 1990
%P 607-627
%V 35
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1990_35_3_a4/
%G en
%F IM2_1990_35_3_a4