@article{10_4153_CMB_2015_062_1,
     author = {Llibre, Jaume and Zhang, Xiang},
     title = {On the {Limit} {Cycles} of {Linear} {Differential} {Systems} with {Homogeneous} {Nonlinearities}},
     journal = {Canadian mathematical bulletin},
     pages = {818--823},
     year = {2015},
     volume = {58},
     number = {4},
     doi = {10.4153/CMB-2015-062-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2015-062-1/}
}