@article{10_4064_ap77_2_3,
     author = {D. R. Dunninger},
     title = {Multiplicity of positive solutions for a
nonlinear fourth order equation},
     journal = {Annales Polonici Mathematici},
     pages = {161--168},
     publisher = {mathdoc},
     volume = {77},
     number = {2},
     year = {2001},
     doi = {10.4064/ap77-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap77-2-3/}
}