@article{04122355,
title = {A variational formalism for the eigenvalues of fourth order boundary value problems.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {12},
year = {1989},
pages = {729-734},
doi = {10.1155/S0161171289000906},
zbl = {0685.34015},
language = {en},
url = {http://dml.mathdoc.fr/item/04122355}
}
Hajj, Adnan A. A variational formalism for the eigenvalues of fourth order boundary value problems.. International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 729-734. doi : 10.1155/S0161171289000906. http://gdmltest.u-ga.fr/item/04122355/