@article{KUTGS_1981_13_a5,
     author = {V. G. Kopp},
     title = {On infinitesimal rotations in a six-dimensional {pseudo-Euclidean} space of signature zero},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {49--56},
     publisher = {mathdoc},
     volume = {13},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1981_13_a5/}
}