TY - JOUR AU - Kehayopulu, N. AU - Tsingelis, M. TI - Pseudoorder in ordered semigroups. JO - Semigroup forum PY - 1995 VL - 50 IS - 3 SP - 389 EP - 392 KW - partially ordered semigroup; homomorphism theorem; isomorphism theorem; pseudoorder; congruence UR - http://eudml.org/doc/135395 ER -