Volume 17, Issue 94, April 2014, Pages 20-27
10.22038/ijogi.2014.2770
Zahra Abedian; Maliheh Dormohamadi
Volume 14, Issue 2, May 2011, Pages 1-6
10.22038/ijogi.2011.5780
Nezhat Mousavifar; Leili Hafizi; Hami Ashraf