MR1086770 Chen, Shao Zhu and Huang, Qing Guang Shaozhu CHEN and Qingguang HUANG Necessary and sufficient conditions for the oscillations of solutions to systems of neutral functional-differential equations Funkcialaj Ekvacioj. Serio Internacia 33 1990 427--440 http://fe.math.kobe-u.ac.jp/FE/Free/vol33/fe33-3-4.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE31-34-en_KML/fe33-427-440/fe33-427-440.pdf http://www.ams.org/mathscinet-getitem?mr=MR1086770 fe33-427-440 1990 Necessary and Sufficient Conditions for the Oscillations of Solutions to Systems of Neutral Functional Differential Equations CHEN, Shaozhu; HUANG, Qingguang CHEN, Shaozhu; HUANG, Qingguang
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