@article{01791001,
title = {Existence criteria for singular initial value problems with sign changing nonlinearities.},
journal = {Mathematical Problems in Engineering},
volume = {7},
year = {2001},
pages = {503-524},
doi = {10.1155/S1024123X01001752},
zbl = {1023.34001},
language = {en},
url = {http://dml.mathdoc.fr/item/01791001}
}
Agarwal, Ravi P.; O'Regan, Donal; Lakshmikantham, V. Existence criteria for singular initial value problems with sign changing nonlinearities.. Mathematical Problems in Engineering, Tome 7 (2001) pp. 503-524. doi : 10.1155/S1024123X01001752. http://gdmltest.u-ga.fr/item/01791001/