periodicities

Shehri, S. M. A., I. Sabbah, S. M. Yousef, and M. Y. Amin, "Solar Forcing On Nile And Cosmic Rays", Modern Trends in Physics. Fourth International Conference MTPR- 10, Edited by L. El Nadi, Cairo and Sharm El Sheikh Egypt, World Scientific Publishing Co. 978-981-4540-88-1, pp. 33-336, 2013. shahinaz_3.pdf