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Translated from Kibernetika i Sistemnyi Analiz, No. 6, pp. 133–144, November–December, 1994.
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Ait Dads, E., Ezzinbi, K. Existence of positive pseudo almost periodic solution for a class of functional equations arising in epidemic problems. Cybern Syst Anal 30, 900–910 (1994). https://doi.org/10.1007/BF02366449
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DOI: https://doi.org/10.1007/BF02366449