@Article{Agarwal2003, author="R. P. Agarwal, S. R. Grace, D. O'Regan", title="Nonoscillatory solutions for discrete equations", journal="Comput. Math. Appl.", year="2003", pages="1297--1302", volume="45" } @Book{Deimling1985, author="K. Deimling", title="Nonlinear Functional Analysis", year="1985", publisher="Springer-Verlag", address="Berlin" } @Article{Liu2007, author="Z. Liu, H. Gao, S. M. Kang, S. H. Shim", title="Existence and mann iterative approximations of nonoscillatory solutions of nth order neutral delay differential equations", journal="J. Math. Anal. Appl.", year="2007", pages="515--529", volume="329" } @Article{Zhang2007, author="Z. G. Zhang, A. J. Yang, C. N. Di", title="Existence of positive solutions of second order nonlinear neutral differential equations with positive and negative terms", journal="J. Appl. Math. Comput.", year="2007", pages="245--253", volume="25" } @Article{Zhou2007, author="Y. Zhou", title="Existence for nonoscillatory solutions of second order nonlinear differential equations", journal="J. Math. Anal. Appl.", year="2007", pages="91--96", volume="331" } @Article{Zhou2008, author="X. L. Zhou, R. Yu", title="Oscillatory behavior of higher order nonlinear neutral forced differential equations with oscillating coefficients", journal="Comput. Math. Anal.", year="2008", pages="1562--1568", volume="56" } @Article{Zhou2005, author="Y. Zhou, B. G. Zhang, Y. Q. Huang", title="Existence for nonoscillatory solutions of higher order nonlinear neutral differential equations", journal="Czechoslovak Math. J.", year="2005", pages="237--253", volume="55" }