Volume 13, Issue 1, January 2012, Pages 111-115
Volume 12, Issue 10, October 2011, Pages 2731-2734
Volume 12, Issue 9, September 2011, Pages 2163-2166
Volume 8, Issue 1, January 2007, Pages 103-108
Volume 1, Issue 4, April 2000, Pages 293-298
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