Geodesic
Determination of the jump of a function of bounded $p$-variation by its Fourier series
Matematičeskie zametki, Tome 12 (1972) no. 1, pp. 19-28.

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A formula is obtained for the jump of a function of bounded $p$-variation at a given point in terms of derivatives of partial sums of its Fourier series. 
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     author = {B. I. Golubov},
     title = {Determination of the jump of a function of bounded $p$-variation by its {Fourier} series},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_12_1_a2/}
}
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B. I. Golubov. Determination of the jump of a function of bounded $p$-variation by its Fourier series. Matematičeskie zametki, Tome 12 (1972) no. 1, pp. 19-28. http://geodesic.mathdoc.fr/item/MZM_1972_12_1_a2/