1. Departament de Física, Universitat de les Illes Balears, 07122 Palma de Mallorca, Balearic Islands, Europe
2. Information Technology Department, Al-Zahra College for Women, P. O. Box 3365, Muscat, Oman
3. Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
4. Department of Information and Computer Science, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
5. Department of Physics, Faculty of Science, King Abdulaziz University Jeddah, P. O. Box 80203, Jeddah 21589, Saudi Arabia
6. Computer Sciences Department, Faculty of Computers and Information, Mansoura University, Egypt
7. University of Science and Technology at Zewail City, 12588 Giza, Egypt