?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Butler%2C+Michael&rft.aulast=Butler&rft.aufirst=Michael&rft.date=February+2009&rft.title=Decomposition+Structures+for+Event-B&rft.genre=proceeding