TY  - JOUR
AU  - A.J. Ovsyannikov
TI  - Lattice isomorphisms of commutative relatively free semigroups.
JO  - Semigroup forum
PY  - 1980
SP  - 189
EP  - 226
VL  - 20
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1980__20_134415/
ID  - SF_1980__20_134415
ER  -