Volume 16, Issue 17, December 2015, Pages 7975-7979
Volume 15, Issue 14, December 2014, Pages 5709-5714
Volume 15, Issue 18, December 2014, Pages 7959-7964
Volume 13, Issue 8, August 2012, Pages 3857-3862
Volume 13, Issue 4, April 2012, Pages 1111-1113
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