@article{SM_2013_204_9_a1,
     author = {A. S. Galaev},
     title = {Conformally flat {Lorentzian} manifolds with special holonomy groups},
     journal = {Sbornik. Mathematics},
     pages = {1264--1284},
     year = {2013},
     volume = {204},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2013_204_9_a1/}
}