@article{10_4064_ap78_3_4,
     author = {Gen-Qiang Wang and Sui Sun Cheng},
     title = {Periodic solutions of $n$th order delay {Rayleigh} equations},
     journal = {Annales Polonici Mathematici},
     pages = {261--266},
     publisher = {mathdoc},
     volume = {78},
     number = {3},
     year = {2002},
     doi = {10.4064/ap78-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap78-3-4/}
}