Volume 12, Issue 7, July 2011, Pages 1855-1860
Volume 12, Issue 5, May 2011, Pages 1179-1184
Volume 12, Issue 5, May 2011, Pages 1239-1244
Volume 12, Issue 1, January 2011, Pages 49-54
Volume 10, Issue 2, February 2009, Pages 213-218