Volume 10, Issue 6, June 2009, Pages 1067-1070
Volume 9, Issue 4, April 2008, Pages 781-784
Volume 9, Issue 1, January 2008, Pages 48-52
Volume 8, Issue 1, January 2007, Pages 45-50
Volume 7, Issue 3, March 2006, Pages 451-454
Volume 4, Issue 2, February 2003, Pages 107-112
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