@article{MZM_1986_39_2_a4,
     author = {L. G. Labsker},
     title = {A test for {Chebyshev} systems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {196--211},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_2_a4/}
}