@article{10_4064_ap81_1_7,
     author = {Ruyun Ma},
     title = {Existence of positive solutions for a nonlinear fourth order
 boundary value problem},
     journal = {Annales Polonici Mathematici},
     pages = {79--84},
     year = {2003},
     volume = {81},
     number = {1},
     doi = {10.4064/ap81-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap81-1-7/}
}