@article{PORMA_2001__58_3_49321,
     author = {Dinca, G. and Jebelean, P. and Mawhin, J.},
     title = {Variational and topological methods for {Dirichlet} problems with {-Laplacian.}},
     journal = {Portugaliae mathematica},
     pages = {339--378},
     publisher = {mathdoc},
     volume = {58},
     number = {3},
     year = {2001},
     zbl = {0991.35023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2001__58_3_49321/}
}