00417nam a2200109Ia 4500008004100000082002000041100002800061245011600089260003800205300001500243490004900258260421b        |||||||| |||| 00| 0 eng d  a519.91bR682.TS  aRockafeller, R. Tyrrell  aThe theory of subgradients and its applications to problems of optimization, convex and non-convex functionsb/  aBerlin:bHaldermann-Verlag,c1981  avii, 107p.  aResearch and education in Mathematicsv v. 1