?url_ver=Z39.88-2004&rft_id=10.1007%2F978-3-662-39921-7_18&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=978-3-662-39921-7&rft.title=On+%CE%B5-Subgradient+Methods+of+Non-Differentiable+Optimization&rft.btitle=International+Symposium+on+Systems+Optimization+and+Analysis&rft.genre=bookitem