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@article{MMO_1956_5_a8, author = {I. S. Iokhvidov and M. G. Krein}, title = {Spectral theory of operators in space with indefinite {metric.~I}}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {367--432}, publisher = {mathdoc}, volume = {5}, year = {1956}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1956_5_a8/} }
I. S. Iokhvidov; M. G. Krein. Spectral theory of operators in space with indefinite metric.~I. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 5 (1956), pp. 367-432. http://geodesic.mathdoc.fr/item/MMO_1956_5_a8/