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@article{SF_1992__44_1_135128, author = {J. Kadourek}, title = {On varieties of combinatorial inverse semigroups {II.}}, journal = {Semigroup forum}, pages = {53--78}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1992}, zbl = {0768.20024}, url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135128/} }
J. Kadourek. On varieties of combinatorial inverse semigroups II.. Semigroup forum, Tome 44 (1992) no. 1, pp. 53-78. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135128/