@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/