Volume 15, Issue 20, December 2014, Pages 8571-8576
Volume 14, Issue 11, November 2013, Pages 6657-6662
Volume 14, Issue 6, June 2013, Pages 3569-3573
Volume 11, Issue 6, June 2010, Pages 1445-1449
Volume 10, Issue 6, June 2009, Pages 963-967
Volume 7, Issue 1, January 2006, Pages 22-31
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