1. Existence and uniqueness theorems for fourth-order boundary value problems;Aftabizadeh, A. R.;J. Math. Anal. Appl.,1986
2. Pure and Applied Mathematics;Berger, Melvin S.,1977
3. Notes on Mathematics and its Applications;Schwartz, J. T.,1969
4. A uniqueness theorem for a boundary value problem;Usmani, Riaz A.;Proc. Amer. Math. Soc.,1979
5. Private communication with R. A. Usmani.