TY  - JOUR
AU  - I. N. Ponomarenko
TI  - Isomorphism problem for classes of graphs closed under contractions
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1988
SP  - 147
EP  - 177
VL  - 174
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1988_174_a6/
LA  - ru
ID  - ZNSL_1988_174_a6
ER  -