?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Maamria%2C+Issam&rft.aulast=Maamria&rft.aufirst=Issam&rft.date=February+2010&rft.title=On+an+Extensible+Rule-based+Prover+for+Event-B&rft.genre=proceeding