TY  - JOUR
AU  - D. R. Hirschfeldt
AU  - B. Khoussainov
TI  - Finitely presented expansions of computably enumerable semigroups
JO  - Algebra i logika
PY  - 2012
SP  - 652
EP  - 667
VL  - 51
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2012_51_5_a5/
LA  - ru
ID  - AL_2012_51_5_a5
ER  -