@article{10_1007_s10587_011_0018_x,
     author = {Alkoumi, Naeem and Torres, Pedro J.},
     title = {On the number of limit cycles of a generalized {Abel} equation},
     journal = {Czechoslovak Mathematical Journal},
     pages = {73--83},
     publisher = {mathdoc},
     volume = {61},
     number = {1},
     year = {2011},
     doi = {10.1007/s10587-011-0018-x},
     mrnumber = {2782760},
     zbl = {1224.34097},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-011-0018-x/}
}