Volume 15, Issue 8, August 2014, Pages 3483-3486
Volume 15, Issue 1, January 2014, Pages 305-308
Volume 13, Issue 12, December 2012, Pages 6203-6206
Volume 12, Issue 7, July 2011, Pages 1723-1726
Volume 8, Issue 2, February 2007, Pages 206-208