TY - JOUR AU - Omid Makhmali TI - Differential Geometric Aspects of Causal Structures JO - Symmetry, integrability and geometry: methods and applications PY - 2018 VL - 14 UR - http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a79/ LA - en ID - SIGMA_2018_14_a79 ER -