@article{GDZPPN001261428, title = {On varieties of combinatorial inverse semigroups II.}, journal = {Semigroup forum}, volume = {44}, year = {1992}, pages = {53-78}, zbl = {0768.20024}, url = {http://dml.mathdoc.fr/item/GDZPPN001261428} }
Kadourek, J. On varieties of combinatorial inverse semigroups II.. Semigroup forum, Tome 44 (1992) pp. 53-78. http://gdmltest.u-ga.fr/item/GDZPPN001261428/