nu.rehman.mm@amu.ac.in
radwan959@yahoo.com
nmuthana@kau.edu.sa
© 2019 Nadeem ur Rehman, Radwan M. Al-omary, Najat Mohammed Muthana, published by University of Silesia in Katowice, Institute of MathematicsThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.