1. Lectures on the Calculus of Variations;Bliss,1961
2. Optimization and control of nonlinear systems using the second variation;Breakwell;J. Control,1963
3. A steepest-ascent method for solving optimum programming problems;Bryson;J. Appl. Mech.,1962
4. Indices for Control System Design Using Optimization Theory;Ellert,1963
5. Numerical Method of Obtaining Solutions of Fixed End Point Problems in the Calculus of Variations;Hestenes,1949