1. Fixed points of T-monotone operators;Chen;Nonlinear Anal.,1995
2. Some fixed point theorems of T-monotone operators;Syau;J. Math. Anal. Appl,1997
3. Monotone Iterative Techniques for Discontinuous Nonlinear Differential Equations;Heikkilä,1994
4. Ordinary Differential Equations;Hartman,1964
5. Monotone Iterative Techniques for Nonlinear Differential Equations;Ladde,1985