1. The Variational Principles of Mechanics;Lanczos,1986
2. Introduction To the Theory of Quantized Fields;Bogoliubov,1980
3. Variational Principles of Continuum Mechanics, Vol.1. Fundamental;Berdichevsky,2009
4. Variational Principles in Heat Transfer: A Unified Lagrangian Analysis of Dissipative Phenomena;Biot,1970
5. Invariante variationsprobleme;Noether,1918