TY  - JOUR
AU  - L. M. Martynov
TI  - On accessible classes of groups and semigroups
JO  - Sbornik. Mathematics
PY  - 1973
SP  - 231
EP  - 241
VL  - 19
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1973_19_2_a7/
LA  - en
ID  - SM_1973_19_2_a7
ER  -