Volume 15, Issue 16, December 2014, Pages 6565-6570
Volume 15, Issue 19, December 2014, Pages 8435-8440
Volume 14, Issue 7, July 2013, Pages 4255-4259
Volume 14, Issue 5, May 2013, Pages 3079-3083
Volume 12, Issue 11, November 2011, Pages 2933-2937
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