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M. A. Sharaf, M. A. Hamdy, M. I. Nouh, S. M. Saad and W. H. Elsanhoury , “Approximate Series Solution for the Physical Parameters of Poltropic and Isothermal Gas Spheres” , NRIAG Journal of Astronomy and Astrophysics , Vol. 2, No. 1, pp. 13-26, 2003. M. A. Sharaf, W. H. Elsanhoury , M. I. Nouh, A. S. Saad, M. A. Hamdy and M. M. Eloker “Relation Between the Tangential Velocity and the Angular Distance to the Vertex for Hyades Stars” , NRIAG Journal of Astronomy and Astrophysics , 2006. W. H. Elsanhoury , M. A. Hamdy, I.A. Issa, M. I. Nouh, A. S. Saad, and S. M. Saad, “Luminosity function of some open clusters” , ISRN Astronomy and Astrophysics , Vol. 2011, Article ID, DOI:10.5402/2011/127030...