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A. Altiner, S. Wilm u. a.: Sputum colour for diagnosis of a bacterial infection in patients with acute cough. In: Scandinavian journal of primary health care. Band 27, Nummer 2, 2009, S. 70–73, doi:10.1080/02813430902759663, PMID 19242860, PMC 3410464 (freier Volltext).