@article{10_21136_CPM_1975_117878,
     author = {Fu\v{c}{\'\i}k, Svatopluk and Mawhin, Jean},
     title = {Periodic solutions of some nonlinear differential equations of higher order},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {276--283},
     publisher = {mathdoc},
     volume = {100},
     number = {3},
     year = {1975},
     doi = {10.21136/CPM.1975.117878},
     mrnumber = {0385240},
     zbl = {0306.34056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1975.117878/}
}