TY - JOUR TI - On the computation of union-extensions of finite semigroups T3 - Acta cybernetica AU - Bröck R. PY - 1973 LA - English SN - 0324-721X UR - http://acta.bibl.u-szeged.hu/12207/1/cybernetica_002_fasc_002_109-113.pdf ER -