@article{DAN_1984_276_2_a4,
     author = {L. G. Labsker},
     title = {Characterization of {Chebyshev} systems and sufficient conditions},
     journal = {Doklady Akademii Nauk},
     pages = {277--281},
     publisher = {mathdoc},
     volume = {276},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_2_a4/}
}