TY  - JOUR
AU  - A. I. Degtyarev
TI  - Classification of surfaces of degree four having a~nonsimple singular point
JO  - Izvestiya. Mathematics 
PY  - 1990
SP  - 607
EP  - 627
VL  - 35
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1990_35_3_a4/
LA  - en
ID  - IM2_1990_35_3_a4
ER  -