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@article{DM_1993_5_4_a4, author = {L. P. Lisovik}, title = {Inclusion and ambiguity problems for regular events in semigroups}, journal = {Diskretnaya Matematika}, pages = {54--74}, publisher = {mathdoc}, volume = {5}, number = {4}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_1993_5_4_a4/} }
L. P. Lisovik. Inclusion and ambiguity problems for regular events in semigroups. Diskretnaya Matematika, Tome 5 (1993) no. 4, pp. 54-74. http://geodesic.mathdoc.fr/item/DM_1993_5_4_a4/