1. Impact of tube design and materials on complications of tracheal intubation;Steen,1988
2. The Univent Tube: Bronchial cuff inflation;Hannallah;Anesthesiology,1991
3. The dimensional interrelationship of the major components of the human tracheobronchial tree;Jesseph;Surg Gynecol Obstet,1957
4. Fuji Systems Corporation: Promotional Brochure: Univent. 23-14, Hongo 3-Chome, Bunkyo-Ku, Tokyo, 113 Japan.
5. Anesthesia for Thoracic Surgery;Benumof,1987