بازدید http://www.pphmj.com/abstract/5886.htm
https://www.ijmttjournal.org/archive/ijmtt-v8p514
http://www.pspchv.com/Abstract%20PDF-PJMMS-Pages%201-144/6.%20Abstract%20%20Pages%2049-54.pdf
بازدید https://www.tpbin.com/article/50124
بازدید https://www.tpbin.com/article/50234