@article{DAN_1961_140_1_a14,
     author = {A. K. Rybnikov},
     title = {Symmetric spaces of affine connection of {class~I}},
     journal = {Doklady Akademii Nauk},
     pages = {59--61},
     publisher = {mathdoc},
     volume = {140},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_140_1_a14/}
}