Geodesic
The uniform convergence of fourier series in orthogonal polynomials
Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 285-295.

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Bounds are obtained for the difference of partial sums of Fourier series for the functionf in two orthogonal systems, permitting a number of known results for Fourier–Chebyshev series to be carried over to Fourier series in certain systems of orthogonal polynomials. 
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     author = {V. M. Badkov},
     title = {The uniform convergence of fourier series in orthogonal polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {285--295},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a1/}
}
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V. M. Badkov. The uniform convergence of fourier series in orthogonal polynomials. Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 285-295. http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a1/