1. The treatment of ventilatory insufficiency after pulmonary resection by tracheostomy and prolonged artificial ventilation;Bjork, V.O.; Engstrem, C.G.;J. !horac. Surg,1955
2. Respiratory infection following tracheostomy;Gotsman, M.S.; Whitby, J.L.;Thorax,1964
3. Early records of tracheotomy;Guthrie, D.;Bull. Hist. Med,1944
4. Tracheostomy in the management of respiratory problems;Head, J.M.;New Engl. J. Med,1961
5. Tracheotomy-its complications and their management. A study of 212 cases;Meade, J.W.;Ibid,1961