1. M. M. Shaikh:
Department of Basic Sciences & Related Studies, Mehran University of Engineering & Technology, Jamshoro, Pakistan
2. M. S. Chandio:
Institute of Mathematics and Computer Science (IMCS), University of Sindh, Jamshoro, Pakistan
3. A. S. Soomro:
Institute of Mathematics and Computer Science (IMCS), University of Sindh, Jamshoro, Pakistan