@article{PORMA_1991__48_3_115756,
     author = {Chuanxi, Q. and Ladas, G. and Yan, J.},
     title = {Oscillations of higher order neutral differential equations},
     journal = {Portugaliae mathematica},
     pages = {291--307},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1991},
     mrnumber = {1127127},
     zbl = {0736.34063},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1991__48_3_115756/}
}