@article{GDZPPN002485559, title = {Equivalence Systems with Finitely Many Relations.}, journal = {Monatshefte f\"ur Mathematik}, volume = {104}, year = {1987}, pages = {77-84}, zbl = {0606.08002}, url = {http://dml.mathdoc.fr/item/GDZPPN002485559} }
Behrendt, Gerhard. Equivalence Systems with Finitely Many Relations.. Monatshefte für Mathematik, Tome 104 (1987) pp. 77-84. http://gdmltest.u-ga.fr/item/GDZPPN002485559/