L. E. Elsgolts - Differential Equations and the Calculus of Variations

CALCULUS OF VARIATIONS and OPTIMAL CONTROL THEORY, M.R. Hestenes 1966 Ex-Library

Morrey C.B. Multiple Integral Problems in the Calculus of Variations and Relate

Calculus of Variations University Mathematical Texts HC VTG Math Book Oliver

1966 Ist Ed Calculus of Variations and Optimal Control Theory By M R Hestenes

Pinch, Enid R. - Optimal Control and the Calculus of Variations

The Calculus of Variations by NI Akhiezer HC DJ 1962

Four books on Calculus of Variations by Sagan, Fox, Gelfand & Fomin, Elsgolc