Document Type : Research Paper
1 Department of Mathematics, Payame Noor University (PNU), P.O. Box 19395-3697, Tehran, Iran
2 Faculty of Engineering Technology, Amol University of Special Modern Technologiesl, Amol, Iran
3 Department of Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, Babolsar, Iran.
4 Department of Engineering Sciences, Faculty of Technology and Engineering, East of Guilan, University of Guilan, Rudsar-Vajargah, Iran.
5 Department of Mathematics, Cankiri Karatekin University, Cankiri, Turkey.