?url_ver=Z39.88-2004&rft_id=doi%3A10.1007%2FBFb0121140&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Demidova%2C+V.+A.&rft.aulast=Demidova&rft.aufirst=V.+A.&rft.date=1986&rft.issn=0303-3929&rft.isbn=978-3-642-00929-7&rft.title=A+directional+implicit+function+theorem+for+quasidifferentiable+functions&rft.btitle=Quasidifferential+Calculus&rft.genre=bookitem