@article{IVM_1995_5_a1,
     author = {N. Bokan and P. B. Gil'keǐ and U. Simon},
     title = {Local affine invariants of second order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--15},
     publisher = {mathdoc},
     number = {5},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1995_5_a1/}
}