This publication is cited in the following articles:
M. G. Grigoryan, “On the absolute convergence of Fourier–Haar series in the metric of $L^p(0,1)$, $0<p<1$”, J. Math. Sci. (N. Y.), 243:6 (2019), 844–858
A. B. Aleksandrov, “Inner functions on compact spaces”, Funct. Anal. Appl., 18:2 (1984), 87–98