TY  - JOUR
AU  - A. I. Shnirel'man
TI  - The degree of a quasi-ruled mapping and a nonlinear Hilbert problem
JO  - Sbornik. Mathematics
PY  - 1972
SP  - 373
EP  - 396
VL  - 18
IS  - 3
UR  - http://geodesic.mathdoc.fr/item/SM_1972_18_3_a1/
LA  - en
ID  - SM_1972_18_3_a1
ER  -