TY  - JOUR
AU  - L.M. Martynov
TI  - On spectra of solvability and attainability for varieties of semigroups.
JO  - Semigroup forum
PY  - 1989
SP  - 129
EP  - 156
VL  - 39
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1989__39_2_134983/
ID  - SF_1989__39_2_134983
ER  -