@article{KUTGS_1981_13_a1,
     author = {F. S. Akhrarov},
     title = {Particular cases of analytic surfaces of the space of non-degenerate null-pairs},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {5--11},
     publisher = {mathdoc},
     volume = {13},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1981_13_a1/}
}