Off-shell construction of superconformal Chern-Simons theories in three   dimensions
  We propose an off-shell construction of three-dimensional N = 3 and N = 4 superconformal Abelian Chern-Simons theories in the projective superspace formalism. We also construct coupling terms among the gauge fields and matter hypermultiplets. 
Masato Arai and Shin Sasaki
hep-th