@article{KUTGS_1981_13_a15,
     author = {Sh. A. Yafarov},
     title = {The {Chebyshev} covectors of an $n$-dimensional net in the spaces $A_n$},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {120--125},
     year = {1981},
     volume = {13},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1981_13_a15/}
}