%0 Journal Article %A Felipe Leitner %T About Twistor Spinors with Zero in Lorentzian Geometry %J Symmetry, integrability and geometry: methods and applications %D 2009 %V 5 %U http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a78/ %G en %F SIGMA_2009_5_a78