Off-shell supergravity-matter couplings in three dimensions
  We develop the superspace geometry of N-extended conformal supergravity in three space-time dimensions. General off-shell supergravity-matter couplings are constructed in the cases N=1,2,3,4. 
Sergei M. Kuzenko, Ulf Lindstrom, Gabriele Tartaglino-Mazzucchelli
hep-th