This article is also available electronically from http://ijoc.org/index.php/ijoc/article/view/1926. This item is licensed under the Creative Commons Attribution Non-commercial NoDerivatives (by-nc-nd) license.
Except where otherwise noted, this item's license is described as: This article is also available electronically from http://ijoc.org/index.php/ijoc/article/view/1926. This item is licensed under the Creative Commons Attribution Non-commercial NoDerivatives (by-nc-nd) license.