1. M. Abramowitz and I.A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, Dover, New York, 1972.
2. A.R. Aftabizadeh, C.P. Gupta and J.M. Xu, Existence and uniqueness theorems for three-point boundary value problems, SIAM J. Math. Anal 20 (1989), 716–726.
3. A.R. Aftabizadeh, Y.K. Huang and N.H. Pavel, Nonlinear third-order differential equations with anti-periodic boundary conditions and some optimal control problems, J. Math. Anal Appl. 192 (1995), 266–289.
4. R.P. Agarwal, Boundary value problems for higher order integro-differential equations, Nonlinear Analysis 7 (1983), 259–270.
5. R.P. Agarwal and S.L. Loi, On approximate Picard’s iterates for multipoint boundary value problems, Nonlinear Analysis 8 (1984), 381–391.