Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1973_10_a2, author = {Yu. I. Volkov}, title = {Certain relations that are connected with semigroups of operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {23--28}, publisher = {mathdoc}, number = {10}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1973_10_a2/} }
Yu. I. Volkov. Certain relations that are connected with semigroups of operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1973), pp. 23-28. http://geodesic.mathdoc.fr/item/IVM_1973_10_a2/