References
- Amann , H. 1976 . Fixed point equations and nonlinear eigenvalue problems in ordered Banach spaces . SIAM Review , 18 : 620 – 709 .
- Ladde , G.S. , Lakshmikantham , V. and Vatsala , A.S. 1985 . Monotone Iterative Techniques for Nonlinear Differential Equations , Boston .
- Krasnoselskii , M.A. 1964 . Positive Solutions of Ope¬rator Equations , 1 : Groningen Noordhoff .
- Deimling , K. 1985 . Nonlinear Functional Analysis , Springer-Verlag .
- Guo Dajun , V. and Lakshmikantham . 1988 . Nonlinear Prob¬lems in Abstract Cone , Academic Press, Inc .
- Sun Jingxian . 1984 . Some Problems on Nonlinear Operators , P.R. China : Shandong University .