Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1970_9_2_a4, author = {Z. K. Litvintseva}, title = {The complexity of individual identity problems in semigroups}, journal = {Algebra i logika}, pages = {172--199}, publisher = {mathdoc}, volume = {9}, number = {2}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1970_9_2_a4/} }
Z. K. Litvintseva. The complexity of individual identity problems in semigroups. Algebra i logika, Tome 9 (1970) no. 2, pp. 172-199. http://geodesic.mathdoc.fr/item/AL_1970_9_2_a4/