@article{CHEB_2020_21_1_a11,
     author = {P. L. Ivankov},
     title = {On linear approximating forms},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {200--212},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2020_21_1_a11/}
}