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Wang, Frank J. S. Asymptotic behavior of some deterministic epidemic models. (English) Zbl 0417.92020 SIAM J. Math. Anal. 9, 529-534 (1978). MSC: 92D25 45D05 45M05 PDFBibTeX XMLCite \textit{F. J. S. Wang}, SIAM J. Math. Anal. 9, 529--534 (1978; Zbl 0417.92020) Full Text: DOI