MR1130461 Cheng, Sui Sun and Yan, Tze Cheung and Li, Horng Jaan Sui Sun CHENG, Tze Cheung YAN and Horng Jaan LI Oscillation criteria for second order difference equation Funkcialaj Ekvacioj. Serio Internacia 34 1991 223--239 http://fe.math.kobe-u.ac.jp/FE/Free/vol34/fe34-2-3.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE31-34-en_KML/fe34-223-239/fe34-223-239.pdf http://www.ams.org/mathscinet-getitem?mr=MR1130461 fe34-223-239 1991 Oscillation Criteria for Second Order Difference Equation Sun CHENG, Sui; Cheung YAN, Tze; Jaan LI, Horng Sun CHENG, Sui; Cheung YAN, Tze; Jaan LI, Horng 1 Atkinson, F. V. Discrete and Continuous Boundary Problems Academic Press, New York 1964 MR0176141 100 Cache/At/Atkinson,Continuous,*,1964,1965 xiv+570
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