Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1977_1_a20, author = {Ya. L. Shapiro and N. I. Zhukova}, title = {Reducible $k$-sheeted structures}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {144--147}, publisher = {mathdoc}, number = {1}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1977_1_a20/} }
Ya. L. Shapiro; N. I. Zhukova. Reducible $k$-sheeted structures. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1977), pp. 144-147. http://geodesic.mathdoc.fr/item/IVM_1977_1_a20/