Volume 12, Issue 5, May 2011, Pages 1155-1159
Volume 9, Issue 4, April 2008, Pages 815-832
Volume 9, Issue 3, March 2008, Pages 371-380
Volume 7, Issue 4, April 2006, Pages 509-514
Volume 7, Issue 1, January 2006, Pages 157-160
Volume 3, Issue 1, January 2002, Pages 47-54
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