@article{10_4153_CMB_1969_009_3,
     author = {Stevens, R.R.},
     title = {On the {Forced} {Lienard} {Equation}},
     journal = {Canadian mathematical bulletin},
     pages = {79--84},
     year = {1969},
     volume = {12},
     number = {1},
     doi = {10.4153/CMB-1969-009-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-009-3/}
}