@article{PORMA_2001__58_2_49223,
     author = {Haraux, A. and Yan, Q.},
     title = {On a class of second order {ODE} with a typical degenerate nonlinearity.},
     journal = {Portugaliae mathematica},
     pages = {233--254},
     publisher = {mathdoc},
     volume = {58},
     number = {2},
     year = {2001},
     zbl = {0987.34004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2001__58_2_49223/}
}