@article{UZKU_2011_153_3_a14,
     author = {A. S. Galaev},
     title = {On the {Einstein} equation on {Lorentzian} manifolds with parallel distributions of isotropic lines},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {165--174},
     publisher = {mathdoc},
     volume = {153},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2011_153_3_a14/}
}