TY - JOUR AU - O. Givradze TI - Irreducible generating sets of complete semigroups of unions $B_X(S)$ defined by semilattices of the class $\Sigma_1(X,4)$ JO - Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory PY - 2020 SP - 69 EP - 73 VL - 177 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/INTO_2020_177_a6/ LA - ru ID - INTO_2020_177_a6 ER -