category c1 Refereed Journal Article HERDC/ERA 2008/2009 pt.18/9/10; Green in Sherpa - pre- and post-print only ok to archive. LV 8/11/10. e-mail sent to author 15.04.11-MMM. author does not have pre or post print, he is happy to have citation only, (phoned) 18.04.11-MMM; added doi pa.17/8/11