1. Ovassapian A, Yelich SJ, Dykes MH, Brunner EE. Fiberoptic nasotracheal intubation-incidence and causes of failure. Anesth Analg. 1983;62:692–5.
2. Asai T, Shingu K. Difficulty in advancing a tracheal tube over a fiberoptic bronchoscope: incidence, causes and solutions. Br J Anaesth. 2004;92:870–81.
3. Popat M. Practical fibreoptic intubation. 1st ed. Oxford: Butterworth–Heinemann Publishers; 2001. p. 75–95.
4. Morgan GE Jr, Mikhail JS, Murray MJ. Clinical anesthesiology. 3rd ed. New York: Lange Medical Books/McGraw–Hill Medical Publishing Division; 2002. p. 59–77.