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Dedicated to ProfessorMarcel Riesz, on the occasion of his 65th birthday
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Calderon, A.P., Zygmund, A. On the existence of certain singular integrals. Acta Math. 88, 85–139 (1952). https://doi.org/10.1007/BF02392130
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DOI: https://doi.org/10.1007/BF02392130