MR1433917 Haddock, John R. and Zhao, Jiaxiang John R. HADDOCK and Jiaxiang ZHAO Instability for autonomous and periodic functional-differential equations with finite delay Funkcialaj Ekvacioj. Serio Internacia 39 1996 553--570 http://fe.math.kobe-u.ac.jp/FE/Free/vol39/fe39-3-12.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe39-553-570/fe39-553-570.pdf http://www.ams.org/mathscinet-getitem?mr=MR1433917 FE39-553-570 1996 Instability for Autonomous and Periodic Functional Differential Equations with Finite Delay HADDOCK, John R.; ZHAO, Jiaxiang HADDOCK, John R.; ZHAO, Jiaxiang
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