TY  - JOUR
AU  - V. A. Gurvich
AU  - G. B. Shabat
TI  - Maps of surfaces and their schemes
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 1298
EP  - 1303
VL  - 305
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_305_6_a2/
LA  - ru
ID  - DAN_1989_305_6_a2
ER  -