1. Natural isoperimetric conditions in the calculus of variations
2. Applications of the theory of quadratic forms in Hilbert space to the calculus of variations
3. "A General Problem in the Calculus of Variations with Applications to the Paths of Least Time " The RAND Corporation research memorandum (1949). "A General Problem in the Calculus of Variations with Applications to the Paths of Least Time " The RAND Corporation research memorandum (1949).
4. Calculus of Variations and Optimal Control Theory (New York: John Wiley & Sons 1966). Calculus of Variations and Optimal Control Theory (New York: John Wiley & Sons 1966).
5. "Numerical Methods for Obtaining Solutions of Fixed Endpoint Problems in the Calculus of Variations " The RAND Corporation research memorandum 102 (1949). "Numerical Methods for Obtaining Solutions of Fixed Endpoint Problems in the Calculus of Variations " The RAND Corporation research memorandum 102 (1949).