On the Finiteness of the N=4 SUSY Nonlinear Sigma Model in Three   Dimensions
  We construct the {\cal N}=4 supersymmetric nonlinear sigma model in three dimensions which can be expanded in 1/N. We evaluate the effective action at leading order in the 1/N expansion and show the finiteness of the model to this order. 
Takeo Inami, Yorinori Saito and Masayoshi Yamamoto