1. A. R. Saleemi:
Department of Chemical & Material Engineering, University of Engineering & Technology (UET), Lahore, Pakistan
2. Mazhar Hussain:
Chem. Engng. Dep. Univ. Engng. &. Technol. Lahore, Pakistan
3. Tayyab Ahmad:
D.H.Chemicals, Sheikhupura road Lahore, Pakistan