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@article{PORMA_2001__58_2_49137, author = {Ferreira, Jos\'e M.}, title = {Oscillations and nonoscillations in retarded equations.}, journal = {Portugaliae mathematica}, pages = {127--138}, publisher = {mathdoc}, volume = {58}, number = {2}, year = {2001}, zbl = {0983.45001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_2001__58_2_49137/} }
Ferreira, José M. Oscillations and nonoscillations in retarded equations.. Portugaliae mathematica, Tome 58 (2001) no. 2, pp. 127-138. http://geodesic.mathdoc.fr/item/PORMA_2001__58_2_49137/