@article{10_21136_AM_1993_104546,
     author = {Gupta, Chaitan P.},
     title = {Solvability of a forced autonomous {Duffing's} equation with periodic boundary conditions in the presence of damping},
     journal = {Applications of Mathematics},
     pages = {195--203},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {1993},
     doi = {10.21136/AM.1993.104546},
     mrnumber = {1218025},
     zbl = {0785.34024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1993.104546/}
}