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Über lakunäre Reihen nach multiplikativen Funktionensystemen. I, II. (Lacunary series in multiplikative systems of functions. I, II.). (Russian) Zbl 0224.42006

MSC:
42A55 Lacunary series of trigonometric and other functions; Riesz products
42A20 Convergence and absolute convergence of Fourier and trigonometric series
42C10 Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.)
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