@article{SM_1973_19_2_a11,
     author = {V. V. Astrakhantsev},
     title = {Pseudo-Riemannian symmetric spaces with a~commutative holonomy group},
     journal = {Sbornik. Mathematics},
     pages = {287--304},
     year = {1973},
     volume = {19},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_19_2_a11/}
}