@article{02161824,
title = {Essential },
journal = {Journal of Applied Mathematics and Stochastic Analysis},
volume = {2004},
year = {2004},
pages = {1-8},
doi = {10.1155/S1048953304302017},
zbl = {1084.47044},
language = {en},
url = {http://dml.mathdoc.fr/item/02161824}
}
Agarwal, R.P.; O'Regan, Donal. Essential . Journal of Applied Mathematics and Stochastic Analysis, Tome 2004 (2004) pp. 1-8. doi : 10.1155/S1048953304302017. http://gdmltest.u-ga.fr/item/02161824/