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Collected mathematical works. In three volumes. I. Dirichlet series, the Riemann zeta-function. II. Almost periodic functions. III. Almost periodic functions. Linear congruences. Diophantine approximations. Function theory. Addition of convex curves. Other papers. Encyclopaedia article. Supplements. Edited by Erling Følner and Børge Jessen. (English) Zbl 0049.00105
København: Dansk Matematisk Forening. XXXIV, 916; IX, 970; X, 992 p. (1952).