@article{107070, author = {Ji\v r\'\i\ Rach\r unek}, title = {Categories of systems of $X$-relations}, journal = {Archivum Mathematicum}, volume = {016}, year = {1980}, pages = {175-184}, zbl = {0447.18001}, mrnumber = {594463}, language = {en}, url = {http://dml.mathdoc.fr/item/107070} }
Rachůnek, Jiří. Categories of systems of $X$-relations. Archivum Mathematicum, Tome 016 (1980) pp. 175-184. http://gdmltest.u-ga.fr/item/107070/
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