@article{SM_1969_9_3_a5,
     author = {Yu. S. Ilyashenko},
     title = {An example of eqations $\frac{dw}{dz}=\frac{P_n(z,w)}{Q_n(z,w)}$ having a~countable number of limit cycles and arbitrarily large {Petrovskii--Landis} genus},
     journal = {Sbornik. Mathematics},
     pages = {365--378},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_9_3_a5/}
}