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- [5] Convergence of trigonometrical series JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1926, 155 (1/4): : 15 - 25
- [6] To the theory of normed rings II On absolutely convergent trigonometrical series and integrals COMPTES RENDUS DE L ACADEMIE DES SCIENCES DE L URSS, 1939, 25 : 570 - 572