c1 Refereed Journal Article.   ---MA 18/7/14. Green in Sherpa: Author's Pre-print:   author can archive pre-print (ie pre-refereeing) 
Author's Post-print:   author can archive post-print (ie final draft post-refereeing) 
Publisher's Version/PDF:   author can archive publisher's version/PDF 
Requested (Terence) permission, 14.8.14-MMM. - “VU paid APC for this article”, 31.8.16--MMM