@incollection{iiasa14268,
          volume = {14},
          number = {14},
          series = {Lecture Notes in Control and Information Sciences},
       booktitle = {International Symposium on Systems Optimization and Analysis},
          editor = {A. Bensoussan and J.L. Lions},
           title = {On ?-subgradient methods of non-differentiable optimization},
         address = {Germany},
       publisher = {Springer Berlin Heidelberg},
            year = {1979},
             doi = {doi:10.1007/BFb0002654},
           pages = {187--195},
             url = {https://pure.iiasa.ac.at/id/eprint/14268/},
            isbn = {978-3-540-35232-7},
          author = {Nurminski, E. A.}
}