Null pseudo-isotropic Lagrangian surfaces
  In this paper we will show that a Lagrangian, Lorentzian surface $M^2_1$ in a complex pseudo space form $\widetilde M^2_1 (4c)$ is pseudo-isotropic if and only if $M$ is minimal. Next we will obtain a complete classification of all Lagrangian, Lorentzian surfaces which are lightlike pseudo-isotropic but not pseudo-isotropic. 
Alfonso Carriazo, Ver\'onica Mart\'in-Molina, Luc Vrancken
math.DG