MR1311559
Cheng, Sui Sun
Sui Sun CHENG
Hille-Wintner type comparison theorems for nonlinear difference equations
Funkcialaj Ekvacioj. Serio Internacia
37
1994
531--535
http://fe.math.kobe-u.ac.jp/FE/Free/vol37/fe37-3-8.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe37-531-535/fe37-531-535.pdf
http://www.ams.org/mathscinet-getitem?mr=MR1311559
fe37-531-535
1994
Hille-Wintner Type Comparison Theorems for Nonlinear Difference Equations
Sun CHENG, Sui
Sun CHENG, Sui
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