Source: https://orbi.uliege.be/bitstream/2268/180936/1/M.%20Delnoy%20et%20-%20Parkings%20-%20permis%20d%27urbanisme%2C%20permis%20d%27environnement%20et%20autorisations%20connexes%20en%20R%C3%A9gion%20wallonne.pdf