relation: https://pure.iiasa.ac.at/id/eprint/14268/ title: On ɛ-subgradient methods of non-differentiable optimization creator: Nurminski, E.A. publisher: Springer Berlin Heidelberg contributor: Bensoussan, A. contributor: Lions, J.L. date: 1979 type: Book Section type: PeerReviewed identifier: Nurminski, E.A. ORCID: https://orcid.org/0000-0002-7236-6955 (1979). On ɛ-subgradient methods of non-differentiable optimization. In: International Symposium on Systems Optimization and Analysis. Eds. Bensoussan, A. & Lions, J.L., pp. 187-195 Germany: Springer Berlin Heidelberg. ISBN 978-3-540-35232-7 10.1007/BFb0002654 . relation: doi:10.1007/BFb0002654 identifier: doi:10.1007/BFb0002654