1. Lectures on the Calculus of Variations;Bliss,1963
2. Calculus of Variations;Gelfand,1963
3. Calculus of Variations with Applications to Physics and Engineering;Weinstock,1974
4. Solid Mechanics: A Variational Approach;Dym,1973
5. Calculus of Variations and Optimal Control Theory;Hestenes,1966