@article{10_4153_CMB_1990_009_8,
     author = {Gu{\'\i}\~nez, V{\'\i}ctor and S\'aez, Eduardo and Sz\'ant\'o, Iv\'an},
     title = {Limit {Cycles} {Close} to {Infinity} of {Certain} {Non-Linear} {Differential} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {55--59},
     year = {1990},
     volume = {33},
     number = {1},
     doi = {10.4153/CMB-1990-009-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1990-009-8/}
}