?url_ver=Z39.88-2004&rft_id=doi%3A10.1007%2FBFb0002654&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nurminski%2C+E.A.&rft.aulast=Nurminski&rft.aufirst=E.A.&rft.date=1979&rft.isbn=978-3-540-35232-7&rft.title=On+%C9%9B-subgradient+methods+of+non-differentiable+optimization&rft.btitle=International+Symposium+on+Systems+Optimization+and+Analysis&rft.genre=bookitem