@article{00590306,
title = {The method of lower and upper solutions for },
journal = {Journal of Applied Mathematics and Stochastic Analysis},
volume = {7},
year = {1994},
pages = {33-47},
doi = {10.1155/S1048953394000043},
zbl = {0801.34026},
language = {en},
url = {http://dml.mathdoc.fr/item/00590306}
}
Cabada, Alberto. The method of lower and upper solutions for . Journal of Applied Mathematics and Stochastic Analysis, Tome 7 (1994) pp. 33-47. doi : 10.1155/S1048953394000043. http://gdmltest.u-ga.fr/item/00590306/