1. Lectures on the Calculus of Variations;Bliss,1946
2. A general problem in the calculus of variations with applications to paths of least time;Hestenes;The RAND Corporation, Res. Memo. RM-100,1949
3. On multipliers for Lagrange problems;McShane;Am. J. Math.,1939
4. Necessary conditions in generalized-curve problems of the calculus of variations;McShane;Duke Math. J.,1940
5. Optimal control processes;Pontryagin;Uspekhi Mat. Nauk.,1959