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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 3, pp. 612–622, May–June, 1975.
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Shepeleva, R.P., Yakubovich, V.A. Critical frequencies of canonical fractionally periodic equations. Sib Math J 16, 471–479 (1975). https://doi.org/10.1007/BF00967538
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DOI: https://doi.org/10.1007/BF00967538