@article{bwmeta1.element.desklight-c06243a3-6384-4ffb-b62b-3f9a4ba2970a,
author = {J. W\k egrzyn},
title = {Differential equations with infinite number of limit cycles},
journal = {Applicationes Mathematicae},
volume = {12},
year = {1971},
pages = {391-395},
zbl = {0262.34019},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-c06243a3-6384-4ffb-b62b-3f9a4ba2970a}
}
J. Węgrzyn. Differential equations with infinite number of limit cycles. Applicationes Mathematicae, Tome 12 (1971) pp. 391-395. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-c06243a3-6384-4ffb-b62b-3f9a4ba2970a/