@article{ISU_2020_20_3_a0,
     author = {D. A. Bredikhin},
     title = {On semigroups of relations with the operation of left and right rectangular products},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {280--289},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ISU_2020_20_3_a0/}
}