@article{TM_2020_308_a7,
     author = {D. G. Vasilchenkova and V. I. Danchenko},
     title = {Extraction of {Several} {Harmonics} from {Trigonometric} {Polynomials.} {Fej\'er-Type} {Inequalities}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {101--115},
     publisher = {mathdoc},
     volume = {308},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2020_308_a7/}
}