1. Variational methods for the solution of problems of equilibrium and vibration;Courant;Bull. AMS,1943
2. A Computational approach to necessary conditions in mathematical programming;Beltrami;ICC Bull.,1967
3. An accelerated gradient method for parameter optimization with nonlinear constraints;Kelley;J.A.S.,1966
4. Calculus of variations and supplementary notes;Courant;NYU lecture notes,1956
5. A method of Courant for minimizing functionals;Butler;J. Math. Phy.,1962