Geodesic
Oscillation of delay differential equation with several positive and negative coefficients
Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 23 (2003) no. 1, pp. 39-52.

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Some sufficient conditions for oscillation of a first order nonautonomuous delay differential equation with several positive and negative coefficients are obtained.
Keywords: oscillation, delay differential equations with several coefficients 
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Elabbasy, E.; Saker, S. Oscillation of delay differential equation with several positive and negative coefficients. Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 23 (2003) no. 1, pp. 39-52. http://geodesic.mathdoc.fr/item/DMDICO_2003_23_1_a3/

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