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@article{MASLO_1989__39_3_a3, author = {\v{S}lapal, Josef}, title = {On the direct power of relational systems}, journal = {Mathematica slovaca}, pages = {251--255}, publisher = {mathdoc}, volume = {39}, number = {3}, year = {1989}, mrnumber = {1016341}, zbl = {0686.08001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1989__39_3_a3/} }
Šlapal, Josef. On the direct power of relational systems. Mathematica slovaca, Tome 39 (1989) no. 3, pp. 251-255. http://geodesic.mathdoc.fr/item/MASLO_1989__39_3_a3/