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2. Analysis of 526 cases of tracheostomy;Atkins;Laryngoscope,1960
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4. Cicatricial tracheal stenosis after tracheostomy: Report of a case;Chance;Proc. Mayo Clin.,1954
5. On stenosis of the trachea after tracheotomy for croup and diphtheria;Colles;Ann. Surg.,1886