Authors
Deeba Afzal
Department of Mathematics, University of Lahore, Near Raiwind Road, Lahore, Pakistan
Gerhard Pfister
Department of Mathematics, University of Kaiserslautern, Erwin-Schrödinger-Str. 67663, Kaiserslautern, Germany
© 2017 Deeba Afzal, Gerhard Pfister, published by Ovidius University of Constanta
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.