Geodesic
Monotone approximation of functions by trigonometric polynomials
Matematičeskie zametki, Tome 34 (1983) no. 3, pp. 375-386 
A. Yu. Shadrin. Monotone approximation of functions by trigonometric polynomials. Matematičeskie zametki, Tome 34 (1983) no. 3, pp. 375-386. http://geodesic.mathdoc.fr/item/MZM_1983_34_3_a7/
@article{MZM_1983_34_3_a7,
     author = {A. Yu. Shadrin},
     title = {Monotone approximation of functions by trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {375--386},
     year = {1983},
     volume = {34},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_3_a7/}
}
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