@article{GDZPPN001251163, title = {Relationships between conbinatorics and 0-simple semigroups.}, journal = {Semigroup forum}, volume = {12}, year = {1976}, pages = {78-82}, zbl = {0322.20029}, url = {http://dml.mathdoc.fr/item/GDZPPN001251163} }
Pollatchek, A. Relationships between conbinatorics and 0-simple semigroups.. Semigroup forum, Tome 12 (1976) pp. 78-82. http://gdmltest.u-ga.fr/item/GDZPPN001251163/