TY  - JOUR
AU  - V. O. Manturov
AU  - D. A. Fedoseev
TI  - Invariants of homotopy classes of curves and graphs on $2$-surfaces
JO  - Fundamentalʹnaâ i prikladnaâ matematika
PY  - 2013
SP  - 89
EP  - 105
VL  - 18
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FPM_2013_18_4_a6/
LA  - ru
ID  - FPM_2013_18_4_a6
ER  -