c1 Refereed Journal Article. 12/3/14 HD.
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 (Stephen) Accepted or Published v & Permission, 19.9.14-MMM