Volume 14, Issue 8, August 2013, Pages 4635-4639
Volume 13, Issue 9, September 2012, Pages 4505-4510
Volume 12, Issue 1, January 2011, Pages 77-80
Volume 11, Issue 4, April 2010, Pages 1115-1118
Volume 10, Issue 6, June 2009, Pages 1051-1055