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A spectral theory for certain operators on a direct sum of Hilbert spaces. (English) Zbl 0139.31202


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[1] Calderón, A. P., andA. Zygmund: On the existence of certain singular integrals. Acta Math.88, 85-139 (1952). · Zbl 0047.10201 · doi:10.1007/BF02392130
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