1. Aviation University of Air Force, Fundamental Departmental, Changchun, Jilin 130000, China
2. Mudanjiang Normal University, School of Mathematical Sciences Mudanjiang, Heilongjiang 157011, China
3. Department of Mathematics, COMSATS University Islamabad, Attock Campus, Pakistan
4. Govt. Girls Primary School, Kamra Khurd, Attock 43570, Pakistan