@article{01283602,
title = {Eigenvalues of boundary value problems for higher-order differential equations.},
journal = {Mathematical Problems in Engineering},
volume = {2},
year = {1996},
pages = {401-434},
doi = {10.1155/S1024123X96000415},
zbl = {0921.34021},
language = {en},
url = {http://dml.mathdoc.fr/item/01283602}
}
Wong, Patricia J.Y.; Agarwal, Ravi P. Eigenvalues of boundary value problems for higher-order differential equations.. Mathematical Problems in Engineering, Tome 2 (1996) pp. 401-434. doi : 10.1155/S1024123X96000415. http://gdmltest.u-ga.fr/item/01283602/