OA - HD 18/12/17. --
Green in Sherpa: Author's Pre-print: 	green tick  author can archive pre-print (ie pre-refereeing)
Author's Post-print: 	green tick  author can archive post-print (ie final draft post-refereeing)
Publisher's Version/PDF: 	green tick  author can archive publisher's version/PDF
General Conditions: 	

    On authors' personal website and open access repositories
    Publisher's version/PDF may be used
    Creative Commons Attribution License or Creative Commons Attribution Non-Commercial License available (depending on requirement of funding agency)
    Published source must be acknowledged
    Authors retain copyright. --
Full-text added, 19.12.17-MMM