@article{article58c65ccb,
title   = {Positive solutions to a fourth-order elliptic problem by the Lusternik-Schnirelmann category},
author = {Melo, Jéssyca Lange Ferreira and Moreira dos Santos, Ederson},
year = {2014},
doi = {10.1016/j.jmaa.2014.05.084},
journal   = {Journal of Mathematical Analysis and Applications}
}