@article{01560852,
title = {Efficiency in terms of Lagrangian.},
journal = {APPS. Applied Sciences},
volume = {3},
year = {2001},
pages = {11-19},
zbl = {1033.90114},
language = {en},
url = {http://dml.mathdoc.fr/item/01560852}
}
Bebu, I.; Ureche, G. Efficiency in terms of Lagrangian.. APPS. Applied Sciences, Tome 3 (2001) pp. 11-19. http://gdmltest.u-ga.fr/item/01560852/