Yellow in Sherpa; pre-print only allowed for archiving; post-print allowed subject to restrictions: 12 month embargo for STM Journals; 18 month embargo for SSH journals lv 11/10/10. e-mail sent to author 13.10.10-MMM; added doi pa.31/8/11. Added: category c1 Refereed Journal Article pt.20/10/09. and added ResPubID: 9134 from dup. 20.2.12-MMM. -- Generic Permission Form added to Dark Archive 06.10.20-MMM.