1. Department of Mathematical Sciences, Shahrood University of Technology, Shahrood, Iran, E-mail: m.iranmanesh2012@gmail.com
2. Faculty of Mechanical Engineering, University of Belgrade, Serbia, E-mail: radens@beotel.rs
3. Department of Mathematical Sciences, Shahrood University of Technology, Shahrood, Iran, E-mail:enfazh.bmaam@gmail.com