@article{10_4153_CMB_1967_008_6,
     author = {Kemp, R.R.D.},
     title = {On {Periodic} {Solutions} of x''' + ax'' + b' + g(x) = 0},
     journal = {Canadian mathematical bulletin},
     pages = {75--77},
     year = {1967},
     volume = {10},
     number = {1},
     doi = {10.4153/CMB-1967-008-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-008-6/}
}