Variational Principles by Moiseiwitsch, B. L.

The Variational Principles of - Paperback, by Cornelius Lanczos - Very Good

Gauge Theory And Variational Principles

Tensors, Differential Forms, and Variational Principles

The Variational Principles of - Paperback, by Cornelius Lanczos - Acceptable

The Variational Principles of Mechanics (Dover Books on Physics) - GOOD

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Variational Principles (Paperback or Softback)