15.5.18-MMM. --
Blue in Sherpa: Author's Pre-print: 	cross  author cannot archive pre-print (ie pre-refereeing)
Author's Post-print: 	cross  author cannot archive post-print (ie final draft post-refereeing)
Publisher's Version/PDF: 	green tick  author can archive publisher's version/PDF
General Conditions: 	

    Author only may request permission
    Publisher's version/PDF must be used
    On author's personal website, employer's website or institutional repository only
    Publisher copyright and source must be acknowledged
    Must link to publisher version.  -- Unable to download publisher version, requested 77.18-MMm