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@article{MASLO_1969__19_4_a10, author = {Schein, B. M.}, title = {Involuted {Restrictive} {Bisemigroups} of {Binary} {Relations}}, journal = {Mathematica slovaca}, pages = {307--315}, publisher = {mathdoc}, volume = {19}, number = {4}, year = {1969}, mrnumber = {0302808}, zbl = {0194.02301}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1969__19_4_a10/} }
Schein, B. M. Involuted Restrictive Bisemigroups of Binary Relations. Mathematica slovaca, Tome 19 (1969) no. 4, pp. 307-315. http://geodesic.mathdoc.fr/item/MASLO_1969__19_4_a10/