On the Beckmann&amp;#8211;Black problem

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Nour Ghazi Acta Arithmetica 149 (2011), 265-274 MSC: Primary 12F12; Secondary 12E25, 14H30. DOI: 10.4064/aa149-3-4

Nour GhaziLaboratoire Paul Painlevé, Mathématiques
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