Oscillation in first order nonlinear retarded argument differential equations
Warren E. Shreve
Proc. Amer. Math. Soc. 41 (1973), 565-568
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Abstract: A result of Ladas, Lakshmikantham, and Papadakis  concerning oscillation caused by lag in linear first order retarded argument differential equations is generalized to the sublinear case. Examples showing that such generalization to the superlinear case is impossible are given.
Lakshmikantham, and J.
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T. Kiguradze, Oscillatory solutions for a
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Retarded argument differential equation,
oscillation of solutions
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