?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Snook%2C+Colin&rft.aulast=Snook&rft.aufirst=Colin&rft.date=February+2008&rft.title=UML-B+and+Event-B%3A+an+integration+of+languages+and+tools&rft.genre=proceeding