@article{10_4064_ap_54_2_155_166,
     author = {Jan Bochenek},
     title = {An abstract nonlinear second order differential equation},
     journal = {Annales Polonici Mathematici},
     pages = {155--166},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1991},
     doi = {10.4064/ap-54-2-155-166},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-54-2-155-166/}
}