?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=ing.+S.&rft.aulast=Jonkers&rft.au=Jonkers%2C+ing.+S.&rft.degree=Master&rft.title=Riga+verder+op+de+fiets%3F&rft.date=2011