Criteria for the discreteness of the spectrum of a singular string
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1958), pp. 136-153
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@article{IVM_1958_2_a11,
author = {I. S. Kats and M. G. Krein},
title = {Criteria for the discreteness of the spectrum of a~singular string},
journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
pages = {136--153},
year = {1958},
number = {2},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/IVM_1958_2_a11/}
}
I. S. Kats; M. G. Krein. Criteria for the discreteness of the spectrum of a singular string. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1958), pp. 136-153. http://geodesic.mathdoc.fr/item/IVM_1958_2_a11/