@article{10_4064_ap_52_2_161_164,
     author = {Dang Dinh Hai},
     title = {Multiple solutions for a nonlinear second order differential equation},
     journal = {Annales Polonici Mathematici},
     pages = {161--164},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {1990},
     doi = {10.4064/ap-52-2-161-164},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-52-2-161-164/}
}