%0 Journal Article %A Yu. S. Ilyashenko %T 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 %J Sbornik. Mathematics %D 1969 %P 365-378 %V 9 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1969_9_3_a5/ %G en %F SM_1969_9_3_a5