Volume 13, Issue 1, January 2012, Pages 399-402
Volume 12, Issue 12, December 2011, Pages 3483-3488
Volume 12, Issue 10, October 2011, Pages 2601-2606
Volume 12, Issue 10, October 2011, Pages 2713-2716
Volume 12, Issue 3, March 2011, Pages 575-580
Volume 11, Issue 5, May 2010, Pages 1355-1358
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