Volume 15, Issue 37, February 2013, Pages 21-28
10.22038/ijogi.2013.468
Sedighe Nasrollahi; Parvaneh Heydari; Zohreh Khalajinia
Volume 14, Issue 2, May 2011, Pages 20-27
10.22038/ijogi.2011.5783
Zarrin Ajoodani; Parvaneh Heidari; Sedigheh Nasrollahi