Volume 15, Issue 15, December 2014, Pages 6339-6342
Volume 15, Issue 3, March 2014, Pages 1375-1379
Volume 11, Issue 6, June 2010, Pages 1723-1725
Volume 9, Issue 2, February 2008, Pages 283-286
Volume 9, Issue 1, January 2008, Pages 58-62