@article{10_1007_s10492_010_0007_7,
     author = {Zhou, Yinggao and Wu, Min},
     title = {On existence of positive periodic solutions of a kind of {Rayleigh} equation with a deviating argument},
     journal = {Applications of Mathematics},
     pages = {189--196},
     publisher = {mathdoc},
     volume = {55},
     number = {3},
     year = {2010},
     doi = {10.1007/s10492-010-0007-7},
     mrnumber = {2657833},
     zbl = {1224.34235},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-010-0007-7/}
}