?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Groot%2C+J.+de&rft.aufirst=J.+de&rft.aulast=Groot&rft.degree=Master&rft.title=Roles+in+the+sustainable+energy+field%3A+investigating+the+current+roles+and+the+desired+situation&rft.date=2016