Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1985_5_a5, author = {\`E. M. Saak}, title = {Summation of {Neumann} series}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {31--33}, publisher = {mathdoc}, number = {5}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1985_5_a5/} }
È. M. Saak. Summation of Neumann series. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1985), pp. 31-33. http://geodesic.mathdoc.fr/item/IVM_1985_5_a5/