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@article{SEMR_2007_4_a1, author = {A. E. Frid}, title = {Canonical decomposition of catenation of factorial languages}, journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a}, pages = {12--19}, publisher = {mathdoc}, volume = {4}, year = {2007}, language = {en}, url = {http://geodesic.mathdoc.fr/item/SEMR_2007_4_a1/} }
A. E. Frid. Canonical decomposition of catenation of factorial languages. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 4 (2007), pp. 12-19. http://geodesic.mathdoc.fr/item/SEMR_2007_4_a1/