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@article{AM2_1977__15_136650, author = {Frank D. Farmer}, title = {Characteristic for reflexive relations.}, journal = {Aequationes mathematicae}, pages = {195--200}, publisher = {mathdoc}, volume = {15}, year = {1977}, zbl = {0376.55003}, url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136650/} }
Frank D. Farmer. Characteristic for reflexive relations.. Aequationes mathematicae, Tome 15 (1977), pp. 195-200. http://geodesic.mathdoc.fr/item/AM2_1977__15_136650/