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Izvestiya VUZ. Radiofizika, Vol. 10, No. 11, pp. 1479–1488, 1967
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Neimark, Y.I., Fishman, L.Z. Quasi-linear differential equations with time delays which depend on time and the unknown function. Radiophys Quantum Electron 10, 829–834 (1967). https://doi.org/10.1007/BF01039760
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DOI: https://doi.org/10.1007/BF01039760