@article{700431,
     title = {Oscillation and nonoscillation criteria for retarded functional differential equations},
     booktitle = {Proceedings of Equadiff 11},
     series = {GDML\_Books},
     publisher = {Comenius University Press},
     address = {Bratislava},
     year = {2007},
     pages = {353-362},
     url = {http://dml.mathdoc.fr/item/700431}
}

Pedro, Ana. Oscillation and nonoscillation criteria for retarded functional differential equations, dans Proceedings of Equadiff 11, GDML_Books,  (2007), pp. 353-362. http://gdmltest.u-ga.fr/item/700431/