TY - JOUR AU - D. M. Motin TI - On identical transformations in commutative semigroups JO - Diskretnaya Matematika PY - 2007 SP - 139 EP - 149 VL - 19 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DM_2007_19_4_a9/ LA - ru ID - DM_2007_19_4_a9 ER -