1. M. A. El-Hashash:
Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo, Egypt
2. A. A. Afify:
Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo, Egypt
3. M. El-Kady:
Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo, Egypt
4. R. M. Saleh:
Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo, Egypt