@article{SIGMA_2018_14_a79,
     author = {Omid Makhmali},
     title = {Differential {Geometric} {Aspects} of {Causal} {Structures}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2018},
     volume = {14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a79/}
}