@article{00735697,
title = {Existence principles for second order nonresonant boundary value problems.},
journal = {Journal of Applied Mathematics and Stochastic Analysis},
volume = {7},
year = {1994},
pages = {487-507},
doi = {10.1155/S1048953394000389},
zbl = {0819.34019},
language = {en},
url = {http://dml.mathdoc.fr/item/00735697}
}
O'Regan, Donal. Existence principles for second order nonresonant boundary value problems.. Journal of Applied Mathematics and Stochastic Analysis, Tome 7 (1994) pp. 487-507. doi : 10.1155/S1048953394000389. http://gdmltest.u-ga.fr/item/00735697/