Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1989_11_a4, author = {N. M. Zobin and V. G. Zobina}, title = {Minimal sufficient collections for semigroups of operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {31--35}, publisher = {mathdoc}, number = {11}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1989_11_a4/} }
N. M. Zobin; V. G. Zobina. Minimal sufficient collections for semigroups of operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1989), pp. 31-35. http://geodesic.mathdoc.fr/item/IVM_1989_11_a4/