@article{IVM_1986_1_a7,
     author = {A. K. Rybnikov},
     title = {Projective and conformal normals and connections},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {60--69},
     year = {1986},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_1_a7/}
}