1. Lectures on Elliptic Boundary Value Problems, Van Nostrand, Princeton, 1965.
2. Interpolation et approximation optimales et “spline functions”
3. Numerical solution of boundary value problems by the perturbed variational principle, Univ. of Maryland Tech. Note BN-624, 1969.
4. Approximation by Hill functions, Univ. of Maryland Tech. Note BN-648, 1970.