References
- Aftabizadeh , A.R. , Gupta , C.P. and Xu , J.M. 1989 . Existence and uniqueness theorems for three-point boundary value problems . SIAM J. Math. Anal , 20 : 716 – 726 .
- Bobisud , L.E. 1989 . Existence of solutions for nonlinear singular boundary value problems . Applic. Anal., to appear , 20
- Granas , A. , Guenther , R.B. and Lee , J. 1985 . Nonlinear Boundary Value Problems for Ordinary Differential Equations , Warsaw .
- Gupta , C.P. 1988 . Existence and uniqueness theorems for the bending of an elastic beam . Applic. Anal , 26 : 289 – 304 .
- O'Regan , D. 1988 . Some new results for second order boundary value problems . to appear , 26