@article{AIHPC_2004__21_5_657_0,
     author = {Du, Yihong},
     title = {Multiplicity of positive solutions for an indefinite superlinear elliptic problem on $R^N$},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {657--672},
     publisher = {Elsevier},
     volume = {21},
     number = {5},
     year = {2004},
     doi = {10.1016/j.anihpc.2003.09.002},
     zbl = {02116183},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2003.09.002/}
}