@article{UZKU_1963_123_1_a2,
     author = {V. G. Kopp},
     title = {Two term bundles of fiber bundles in 3-dimensional {pseudo-Euclidean} space},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {49--58},
     year = {1963},
     volume = {123},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1963_123_1_a2/}
}