Volume 15, Issue 18, December 2014, Pages 7583-7588
Volume 14, Issue 12, December 2013, Pages 7551-7554
Volume 14, Issue 2, February 2013, Pages 829-834
Volume 13, Issue 5, May 2012, Pages 2329-2334
Volume 12, Issue 10, October 2011, Pages 2653-2657