First order neutral di¤erential equations are studied and sufficient conditions are derived for every solution to be oscillatory. Our approach is to reduce the oscillation of neutral differential equations to the nonexistence of eventually positive solutions of non-neutral differential inequalities. Our results extend and improve several known results in the literature.
"Oscillation of solutions of first-order neutral differential equations." Hiroshima Math. J. 32 (1) 79 - 85, March 2002. https://doi.org/10.32917/hmj/1151007643