1. Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University) 1 , Bangalore, Karnataka 560029, India
2. School of Mathematical and Statistical Sciences, The University of Texas Rio Grande Valley 2 , Edinburg, Texas 78539, USA
3. Faculty of Computer Science and Engineering Science, TH Koln-University of Applied Sciences 3 , Gummersbach 51643, Germany