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S. A. Sargsyan, “On divergence of Fourier–Walsh series of continuous function”, Proceedings of the YSU, Physical and Mathematical Sciences, 2015, no. 2, 26–29
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M. G. Grigoryan, S. A. Sargsyan, “Nonlinear approximation of functions from the class $L^r$ with respect to the Vilenkin system”, Izv. Vyssh. Uchebn. Zaved. Mat., 2013, no. 2, 30–39; Russian Math. (Iz. VUZ), 57:2 (2013), 25–33
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