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2. Benign tumors of the trachea and bronchi;Jackson, C.; Jackson, C.L.;JAMA
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4. Papilloma of the bronchus;Ashmore, P.G.;J Thorac Surg,1954
5. Mobile bronchial papilloma spontaneously expectorated;Memon, A.M.; Ramisetti, D.K.; Ayvazian, L.F.;J Med Soc NJ,1978