References
- Cabada , A. and Nieto , J. J. A generalization of the monotone itera¬tive technique for nonlinear second order periodic boundary value problem . J. Math. Anal, Appl. ,
- Ladde , G. S. , Lakshmikantham , V. and Vatsala , A.S. 1985 . Monotone Iterative Techniques for Nonlinear Differential Equations , Bostonn : Pitman Publishing Inc .
- Lakshmikantham , V. 1989 . Periodic Boundary Value Problems of First and Second Order Differential Equations . J. of Applied Math, and Simulation , 2 : 131 – 138 .
- Nieto , J. J. 1988 . Nonlinear second-order periodic boundary value problem . J, Math. Anal. Appl , 130 : 22 – 29 .
- Nieto , J. J. 1988 . Decreasing sequences of absolute compact retracts and nonlinear problems . Boll. Un. Mat. Ital , 7 : 497 – 507 .
- Nieto , J. J. 1988 . Nonlinear second order periodic boundary value problem with Caratheodory functions . Appl. Anal , 7
- Yong , Sun . 1988 . A Fixed Point Theorem for Mixed Monotone Operators with Applications . J. Math. Anal. Appl , 7