Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1968_181_5_a2, author = {M. A. Gol'dman and S. N. Krachkovskii}, title = {Products, powers and contractions of homomorphisms}, journal = {Doklady Akademii Nauk}, pages = {1038--1041}, publisher = {mathdoc}, volume = {181}, number = {5}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_5_a2/} }
M. A. Gol'dman; S. N. Krachkovskii. Products, powers and contractions of homomorphisms. Doklady Akademii Nauk, Tome 181 (1968) no. 5, pp. 1038-1041. http://geodesic.mathdoc.fr/item/DAN_1968_181_5_a2/