%0 Journal Article %A D. A. Bredikhin %T On semigroups of relations with the operation of left and right rectangular products %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2020 %P 280-289 %V 20 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2020_20_3_a0/ %G en %F ISU_2020_20_3_a0