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Number of items: **4**.

Adivar, Murat and Raffoul, Youssef N.:
*Existence of periodic solutions in totally nonlinear delay dynamic equations.*
Electronic journal of qualitative theory of differential equations : special edition, (1) 1.
pp. 1-20.(2009)

Raffoul, Youssef N.:
*Positive periodic solutions in neutral nonlinear differential equations.*
Electronic journal of qualitative theory of differential equations 16.
pp. 1-10.(2007)

Kaufmann, Eric B. and Raffoul, Youssef N.:
*Eigenvalue problems for a three-pint boundary-value problem on a time scale.*
Electronic journal of qualitative theory of differential equations 2.
pp. 1-10.(2004)

Raffoul, Youssef N.:
*Positive solutions of three-point nonlinear second order boundary value problem.*
Electronic journal of qualitative theory of differential equations 15.
pp. 1-11.(2002)