MR0330708 Terry, Raymond D. and Wong, Pui Kei Raymond D. TERRY and Pui Kei WONG Oscillatory properties of a fourth-order delay differential equation Funkcialaj Ekvacioj. Serio Internacia 15 1972 209--221 http://fe.math.kobe-u.ac.jp/FE/Free/vol15/fe15-16.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe15-209-221/fe15-209-221.pdf http://www.ams.org/mathscinet-getitem?mr=MR0330708 fe15-209-221 1972 Oscillatory Properties of a Fourth-order Delay Differential Equation Terry, Raymond D. and Wong, Pui Kei Terry, Raymond D. and Wong, Pui Kei
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