@article{1183504922,
author = {Courant, R.},
title = {Variational methods for the solution of problems of equilibrium and vibrations},
journal = {Bull. Amer. Math. Soc.},
volume = {49},
number = {12},
year = {1943},
pages = { 1-23},
language = {en},
url = {http://dml.mathdoc.fr/item/1183504922}
}
Courant, R. Variational methods for the solution of problems of equilibrium and vibrations. Bull. Amer. Math. Soc., Tome 49 (1943) no. 12, pp. 1-23. http://gdmltest.u-ga.fr/item/1183504922/