%0 Book Section
%A Nurminski, E.A.
%B International Symposium on Systems Optimization and Analysis
%C Germany
%D 1979
%E Bensoussan, A.
%E Lions, J.L.
%F iiasa:14268
%I Springer Berlin Heidelberg
%N 14
%P 187-195
%R doi:10.1007/BFb0002654
%S Lecture Notes in Control and Information Sciences
%T On ɛ-subgradient methods of non-differentiable optimization
%U https://pure.iiasa.ac.at/id/eprint/14268/
%V 14