1. History of Medicine;Garrison,1917
2. Tracheostomy: a new retractor and tube pilot for emergency operation;Hupper;Surg. Gynec. & Obst.,1914
3. History of Medicine;Garrison,1917
4. Tracheotomy: a study of 206 consecutive operations;Figi;Ann. Otol. Rhin. & Laryng.,1934
5. Advantages and complications of tracheostomy;Davis;J. A. M. A.,1953