TY  - JOUR
AU  - V. A. Baltag
AU  - N. I. Vulpe
TI  - The number and multiplicity of singular points of a quadratic
JO  - Doklady Akademii Nauk
PY  - 1992
SP  - 9
EP  - 12
VL  - 323
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1992_323_1_a0/
LA  - ru
ID  - DAN_1992_323_1_a0
ER  -