?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Brankova&rft.au=Brankova%2C+Neli&rft.aufirst=Neli&rft.date=2014&rft.title=The+Implementation+of+Congestion+Charging+in+the+City+of+Sofia%2C+Bulgaria&rft.degree=Master