1. Positive Solutions of Differential, Difference and Integral Equations;Agarwal,1999
2. Multiple Positive Solutions to Boundary Value Problems, Dissertation;Avery,1997
3. A generalization of the Leggett–Williams fixed point theorem;Avery;MSR Hot-Line,1998
4. Three symmetric positive solutions for a second order boundary value problem;Avery;Appl. Math. Lett.,2000
5. Nonlinear Functional Analysis;Deimling,1985