1. Rahman:
Research Institute of Chemistry, Karachi University, Karachi, Pakistan
2. M. Ghazala:
Research Institute of Chemistry, Karachi University, Karachi, Pakistan
3. B. Sultana:
Research Institute of Chemistry, Karachi University, Karachi, Pakistan
4. M. Bashir:
Research Institute of Chemistry, Karachi University, Karachi, Pakistan
5. A. A. Ansari:
Research Institute of Chemistry, Karachi University, Karachi, Pakistan