Lower-dimensional pure-spinor superstrings
  We study to what extent it is possible to generalise Berkovits' pure-spinor construction in d=10 to lower dimensions. Using a suitable definition of a ``pure'' spinor in d=4,6, we propose models analogous to the d=10 pure-spinor superstring in these dimensions. Similar models in d=2,3 are also briefly discussed. 
P. A. Grassi (E. Fermi Ctr. Rome & CERN & Piemonte Orientale Univ.)   and N. Wyllard (CERN)