Geodesic
On the existence and structure of universal functions
Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 496 (2021), pp. 30-33

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The existence of functions the Fourier–Walsh series of which are universal in the sense of signs for the class of almost everywhere finite measurable functions, and the structure of such functions is described.
Keywords: universal functions, Fourier–Walsh series, convergence almost everywhere. 
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     author = {M. G. Grigoryan},
     title = {On the existence and structure of universal functions},
     journal = {Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleni\^a},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {496},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DANMA_2021_496_a5/}
}
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M. G. Grigoryan. On the existence and structure of universal functions. Doklady Rossijskoj akademii nauk. Matematika, informatika, processy upravleniâ, Tome 496 (2021), pp. 30-33. http://geodesic.mathdoc.fr/item/DANMA_2021_496_a5/