@article{107074, author = {Ivan Chajda}, title = {Relational classes and their characterizations}, journal = {Archivum Mathematicum}, volume = {016}, year = {1980}, pages = {199-203}, zbl = {0449.08002}, mrnumber = {594466}, language = {en}, url = {http://dml.mathdoc.fr/item/107074} }
Chajda, Ivan. Relational classes and their characterizations. Archivum Mathematicum, Tome 016 (1980) pp. 199-203. http://gdmltest.u-ga.fr/item/107074/
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