principe variationnel

[1994] Variational principles of irreversible processes ; Masakazu Ichiyanagi ; Physics Reports 243 (1994) p. 125 [lien]
[1996] Direct use of variational principles as an approximation technique in classical mechanics ; C. G. Gray ; G. Karl ; V. A. Novikov ; American Journal of Physics 64 (sep 1996) p. 1177 [lien]