1. CHEP, University of the Punjab, Lahore 54590, Pakistan
2. Department of Mathematics, College of Science, Shanghai University, China
3. Department of Mathematics, University of the Punjab, Lahore 54590, Pakistan
4. Plant Production Department, College of Food and Agriculture Sciences, King Saud University, P. O. Box 2460, Riyadh 11451, Saudi Arabia
5. Prince Sultan Bin Abdulaziz International Prize for Water Chair, Prince Sultan Institute for Environmental, Water and Desert Research, King Saud University, Riyadh 11451, Saudi Arabia