پديدآورندگان :
Jafarian Amiri S. Majid sm_jafarian@znu.ac.ir Department of Mathematics, Faculty of Sciences, University of Zanjan, University Blvd., Zanjan 45371-38791, Iran. , Mohammadlou Karim k.mohammadlou@znu.ac.ir Department of Mathematics, Faculty of Sciences, University of Zanjan, University Blvd., Zanjan 45371-38791, Iran.