Volume 18, Issue 158, August 2015, Pages 1-8
10.22038/ijogi.2015.4799
Marzieh Lotfalizadeh; Nayereh Ghomian; atieh kalateh
Volume 13, Issue 5, November 2010, Pages 8-12
10.22038/ijogi.2010.5822
Shohreh Bahasadri; Nasrin Changizi