c1 Refereed Journal Article, Dr Peng Shi signedVUIR pt.16/10/11. copyrighted abstracted 14/12/11 RD. Green in Sherpa, author can archive pre-print (ie pre-refereeing) 
or post-print (ie final draft post-refereeing), e-mail sent to Peng. 16.12.11-MMM. recv 21.12.11-MMM. Supporting documentation added to dark upload - HD 5/6/18. HERDC documentation added to dark upload - HD 8/7/20