c1 Refereed Journal Article. 15.7.14-MMM. 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 cannot archive publisher's version/PDF. Requested (Peng) Accepted v. & Permission, 08.2014-MMM