@article{IVM_1965_3_a3,
     author = {E. E. Viktorovskii},
     title = {On the theory of fields of cones of directions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {38--45},
     publisher = {mathdoc},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1965_3_a3/}
}