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doi:10.1016/S0893-9659(01)80041-0 
Copyright © 2001 Published by Elsevier Science Ltd. All rights reserved.
Oscillations of solutions of neutral differential equations with positive and negative coefficients*1
Available online 13 July 2001.
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Abstract
We obtain some new results for oscillation of all solutions of the neutral differential equation with positive and negative coefficients
where P, Q, R ε C([t0, ∞), R), r ε (0, ∞, and τ, σ ε (0, ∞). These new results are obtained by establishing and using some new lemmas which are interesting in their own right and which may have further applications in analysis.Author Keywords: Neutral differential equation and oscillations
