1. Department of Mathematics, Shahid Beheshti University, Tehran, Iran
2. Young Researchers and Elite club, Central Tehran Branch, Islamic Azad University, Tehran, Iran
3. Department of Mathematics, Joykrishnapur High School (H.S.), Tamluk, India
4. Department of Applied Mathematics with Oceanology and ComputerProgramming, Vidyasagar University, Midnapore, India