@article{IVM_1959_4_a8,
     author = {G. I. Zhotikov},
     title = {On the theory of the field of local conic surfaces in the composite tangent manifold $E_n(X_n)$ of first {order.~I,~II}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {64--69},
     publisher = {mathdoc},
     number = {4},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_4_a8/}
}