Geodesic
Approximation of differentiable functions by Fourier--Hermite sums
Matematičeskie zametki, Tome 6 (1969) no. 1, pp. 35-46

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An asymptotic formula is derived for the divergence of Fourier–Hermite sums from the functions giving rise to them, for functions $f(x)$ whose $r$-th derivatives have a modulus of continuity not exceeding a given majorizing modulus of continuity. 
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     author = {V. A. Abilov and S. A. Agahanov},
     title = {Approximation of differentiable functions by {Fourier--Hermite} sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {35--46},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_1_a4/}
}
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V. A. Abilov; S. A. Agahanov. Approximation of differentiable functions by Fourier--Hermite sums. Matematičeskie zametki, Tome 6 (1969) no. 1, pp. 35-46. http://geodesic.mathdoc.fr/item/MZM_1969_6_1_a4/