2YANG Shulang.Quasidifferentiability and positive solutions of equations for set-valued mappings[ J].Nonlinear Analysis,Theory,Methods and Applications,1995,25 (5):487-489.
3Donal O'Regan. Some fixed point theorems for concentrative mappings between locally convex linear topological spaces[J]. Nonlinear analysis, theory methods applications, 1996,27(12):1437-1446.
