c1 Refereed Journal Article. YELLOW in Sherpa: author can archive pre-print. Author can archive post-print; subject to Restrictions below: •If signed CTA, only allowed with written permission •0 to 24 months depending on journal and funding agency requirements. Author cannot archive publisher's version/PDF. 16/12/13 HD. In Sherpa now: Author's Pre-print: author can archive pre-print (ie pre-refereeing) Author's Post-print: subject to Restrictions below, author can archive post-print (ie final draft post-refereeing) Restrictions: •12 months embargo Publisher's Version/PDF: author cannot archive publisher's version/PDF. Requested (Bishop) Accepted v. & Permission, 13.8.14-MMM. Both received 10.10.14-MMM. Supporting documentation added to dark upload - HD 23/10/17