TY - JOUR AU - Trch, Milan TI - Groupoids and the associative law. VII. Semigroup distance of SH-groupoids JO - Acta Universitatis Carolinae. Mathematica et Physica PY - 2006 SP - 57 EP - 63 VL - 47 IS - 1 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/item/AUCMP_2006__47_1_a3/ LA - en ID - AUCMP_2006__47_1_a3 ER -