?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Jastram%2C+Michael&rft.aulast=Jastram&rft.aufirst=Michael&rft.date=October+2010&rft.title=ProR%2C+an+Open+Source+Platform+for+Requirements+Engineering+based+on+RIF&rft.genre=proceeding