TY  - JOUR
AU  - V. A. Rokhlin
TI  - The normal Euler numbers of the projective plane and Klein bottle in four-dimensional Euclidean space
JO  - Doklady Akademii Nauk
PY  - 1970
SP  - 27
EP  - 29
VL  - 191
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a6/
LA  - ru
ID  - DAN_1970_191_1_a6
ER  -