@article{EJDE_2003__2003__a14,
     author = {Il'yasov,  Yavdat and Runst,  Thomas},
     title = {Positive solutions for indefinite inhomogeneous {Neumann} elliptic problems},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1109.35337},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a14/}
}