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Additional information
Scientific-Research Institute of Applied Mathematics and Cybernetics at Gor'kii University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 14, No. 7, pp. 967–972, July, 1971.
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Gurtovnik, A.S., Neimark, Y.I. Investigation of an integral toroidal manifold in the critical case. Radiophys Quantum Electron 14, 761–765 (1971). https://doi.org/10.1007/BF01033235
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DOI: https://doi.org/10.1007/BF01033235