@article{DAN_1960_133_1_a4,
     author = {Yu. I. Levin},
     title = {Spaces with affine connection adjoint to $n$~vector fields},
     journal = {Doklady Akademii Nauk},
     pages = {24--27},
     publisher = {mathdoc},
     volume = {133},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a4/}
}