TY - JOUR AU - Kehayopulu, N. TI - On intra-regular ve-semigroups. JO - Semigroup forum PY - 1980 VL - 19 SP - 111 EP - 122 KW - intra-regular semigroup; v-semigroup; l-semigroup; partially ordered semigroup; closed elements UR - http://eudml.org/doc/134375 ER -