TY - JOUR TI - Sandwich semigroups of binary relations T2 - Discrete Mathematics VL - 28 IS - 3 SP - 231 EP - 236 AU - Chase, Karen PB - Elsevier BV PY - 1979 PY - 1979 LA - English SN - 0012-365X UR - http://dx.doi.org/10.1016/0012-365x(79)90130-4 UR - https://katalog.ub.uni-leipzig.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTAxNi8wMDEyLTM2NXgoNzkpOTAxMzAtNA ER -