Volume 14, Issue 2, May 2011, Pages 48-53
10.22038/ijogi.2011.5787
Solyman Zand; Mohamad rafiei; Ashraf Zamani
Volume 12, Issue 3, September 2009, Pages 51-57
10.22038/ijogi.2009.5888
Solyman Zand; Ashraf Zamani