1. Addington WR et al. (1999) Assessing the laryngeal cough reflex and the risk of developing pneumonia after stroke. Arch Phys Med Rehabil Vol 80
2. Affolter F (1990) Wahrnehmung Wirklichkeit und Sprache. Neckar, Villingen-Schwenningen
3. Bonanno PC (1971) Swallowing dysfunction after Tracheostomy Ann. Surg Vol. 174, No. 1
4. Buchholz DW (1996) What is Dysphagia? Dysphagia 11:23–24
5. Buckwalter JA, Sasaki CT (1984) Effect of tracheotomy on laryngeal function Otolaryngologic Clinics of North-America Vol. 17