Authors
Najeeb Alam Khan
Department of Mathematics, University of Karachi, Karachi, Pakistan
Sidra Khan
Department of Mathematics, University of Karachi, Karachi, Pakistan
© 2018 Najeeb Alam Khan, Sidra Khan, published by Lucian Blaga University of Sibiu
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.