Volume 12, Issue 7, July 2011, Pages 1795-1798
Volume 12, Issue 7, July 2011, Pages 1807-1811
Volume 12, Issue 1, January 2011, Pages 77-80
Volume 11, Issue 4, April 2010, Pages 1115-1118
Volume 11, Issue 2, February 2010, Pages 353-358