TY  - JOUR
AU  - Z. K. Litvintseva
TI  - The complexity of certain problems for groups and semigroups
JO  - Doklady Akademii Nauk
PY  - 1970
SP  - 989
EP  - 992
VL  - 191
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1970_191_5_a7/
LA  - ru
ID  - DAN_1970_191_5_a7
ER  -