@article{IVM_2000_5_a12,
     author = {G. N. Timofeev},
     title = {Integrable $\pi$-structure with a~symmetric second covariant derivative of an affinor},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {79--82},
     publisher = {mathdoc},
     number = {5},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2000_5_a12/}
}