c1 Refereed Journal Article, Dr Peng Shi signed VUIR pt.16/10/11. Not checked in Sherpa, 13/12/11 RD. Green in Sherpa, author can archive pre-print (ie pre-refereeing) 
Author can archive post-print (ie final draft post-refereeing), e-mail sent to Peng. 19.12.11-MMM