We would like to offer our warm appreciation to our honorable professors from Math Department of Isfahan University, Dr. Reza Enshaee, for his wise mathematical hints; Dr. Jafar Zafarani, for his clever ideas and nice advice on the sources; Dr. Mohammad Reza Pouriya Vali, for his encouragement, effective advice and suggestions. We also owe a debt of gratitude to Dr. Hossein Barati, from English Department of the University, for his important language and linguistics comments