@article{MZM_1981_29_2_a11,
     author = {A. K. Rybnikov},
     title = {Affine connections of second order},
     journal = {Matemati\v{c}eskie zametki},
     pages = {279--290},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a11/}
}