?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=lecomte%2C+thierry&rft.aulast=lecomte&rft.aufirst=thierry&rft.date=30+August+2007&rft.title=Formal+Methods+in+Safety-Critical+Railway+Systems&rft.genre=proceeding