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@article{10_21136_CMJ_1989_102295, author = {\v{S}lapal, Josef}, title = {On relations}, journal = {Czechoslovak Mathematical Journal}, pages = {198--214}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, doi = {10.21136/CMJ.1989.102295}, mrnumber = {992127}, zbl = {0682.04001}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102295/} }
Šlapal, Josef. On relations. Czechoslovak Mathematical Journal, Tome 39 (1989) no. 2, pp. 198-214. doi : 10.21136/CMJ.1989.102295. http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102295/
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