Volume 12, Issue 8, August 2011, Pages 2001-2006
Volume 12, Issue 4, April 2011, Pages 967-970
Volume 12, Issue 4, April 2011, Pages 1045-1048
Volume 10, Issue 5, May 2009, Pages 815-821
Volume 7, Issue 1, January 2006, Pages 46-50
Volume 6, Issue 3, March 2005, Pages 412-419
)