Lashien, El Said, A. (left GR)

Physics  Department , Faculty of Science

Ain. Shams University, Cairo , Egypt.

E-mail:

Haggag, S.

Mathematics Department , Faculty of Science

Al Azhar University, Assuit, Egypt.

Hindawi, A. A. (left physics)

Physics Department , Faculty of Science

Ain Shams University , Cairo , Egypt.

Ibrahim, Amal.H.

Astronomy Department, Faculty of Science , Cairo University , Giza, Egypt.

Kahil, M. E.

Mathematics Department, The American University in Cairo, Egypt.

E-mail: @