?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=%C3%81.&rft.aulast=Kov%C3%A1cs&rft.au=Kov%C3%A1cs%2C+%C3%81.&rft.degree=Master&rft.date=2013&rft.title=Towards+renewable+energy+economy%3A+Social+innovation+of+grassroots+initiatives