R. Tyrrell Rockafellar. Generalized Subgradients in Mathematical Programming. In Achim Bachem, Bernhard Korte, Martin Grötschel, editors, Mathematical Programming The State of the Art, XIth International Symposium on Mathematical Programming, Bonn, Germany, August 23-27, 1982. pages 368-390, Springer, 1982. [doi]
Abstract is missing.