@article{BUMI_2013_9_6_2_a4,
     author = {Berchio, Elvise},
     title = {A {Note} on {Some} {Nonlinear} {Fourth} {Order} {Differential} {Equations}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {349--361},
     publisher = {mathdoc},
     volume = {Ser. 9, 6},
     number = {2},
     year = {2013},
     zbl = {1291.34031},
     mrnumber = {3112983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2013_9_6_2_a4/}
}