Geodesic
Critical frequencies of canonical systems, invariant with respect to time reversal, with periodic coefficients
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1980), pp. 56-64.

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@article{IVM_1980_9_a11,
     author = {R. P. Shepeleva},
     title = {Critical frequencies of canonical systems, invariant with respect to time reversal, with periodic coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--64},
     publisher = {mathdoc},
     number = {9},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_9_a11/}
}
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R. P. Shepeleva. Critical frequencies of canonical systems, invariant with respect to time reversal, with periodic coefficients. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1980), pp. 56-64. http://geodesic.mathdoc.fr/item/IVM_1980_9_a11/