?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Ferrara%2C+Antonella&rft.aufirst=Antonella&rft.aulast=Ferrara&rft.date=July+2007&rft.title=Gradient+tracking+based+second+order+sliding+mode+control+of+a+wheeled+vehicle&rft.genre=proceeding