Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1971_5_a7, author = {L. S. Koplienko}, title = {The spectrum of the scattering matrix}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {54--61}, publisher = {mathdoc}, number = {5}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1971_5_a7/} }
L. S. Koplienko. The spectrum of the scattering matrix. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1971), pp. 54-61. http://geodesic.mathdoc.fr/item/IVM_1971_5_a7/