1. R.P. Agarwal, On multipoint boundary value problems for discrete equations, J. Math. Anal. Appl. 96 (1983), 520–534.
2. R.P. Agarwal, Initial-value methods for discrete boundary value problems, J. Math. Anal. Appl. 100 (1984), 513–529.
3. R.P. Agarwal, On boundary value problems for second order discrete systems, Applicable Analysis 20 (1985), 1–17.
4. R.P. Agarwal, Computational methods for discrete boundary value problems, Appl. Math. Comp. 18 (1986), 15–41.
5. R.P. Agarwal, Initial and boundary value problems for nth order difference equations, Math. Slovaca 36 (1986), 39–47.