@article{RM_2015_70_2_a1,
     author = {A. S. Galaev},
     title = {Holonomy groups of {Lorentzian} manifolds},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {249--298},
     publisher = {mathdoc},
     volume = {70},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2015_70_2_a1/}
}