@article{CLTM_1999_1999_1_a6,
     author = {Li, Wantong and Yan, Jurang},
     title = {Oscilaci\'on de ecuaciones diferenciales de primer orden neutrales con coeficientes positivos y negativos.},
     journal = {Collectanea mathematica},
     pages = {199-209},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1999_1999_1_a6/}
}