?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Hoang%2C+Thai+Son&rft.aulast=Hoang&rft.aufirst=Thai+Son&rft.date=2011&rft.atitle=Event-B+Patterns+and+Their+Tool+Support&rft.title=Software+and+Systems+Modelling&rft.genre=article