@article{MZM_2006_79_6_a4,
     author = {V. S. Kolesnikov},
     title = {On the boundedness below of trigonometric polynomials of best approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {870--878},
     publisher = {mathdoc},
     volume = {79},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_79_6_a4/}
}