Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1967_3_a9, author = {Yu. S. Markelov}, title = {On the theory of the characteristic functions of isometric operators}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {66--73}, publisher = {mathdoc}, number = {3}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_3_a9/} }
Yu. S. Markelov. On the theory of the characteristic functions of isometric operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1967), pp. 66-73. http://geodesic.mathdoc.fr/item/IVM_1967_3_a9/