1. Beekes R. Etymological Dictionary of Greek. Leiden, Netherlands: Brill; 2010.
2. American Academy of Sleep Medicine. The International Classification of Sleep Disorders, Revised (ICSD-R). Westchester: AASM; 2001. p. 57-8.
3. American Academy of Sleep Medicine. The International Classification of Sleep Disorders, Second Edition (ICSD-2). Westchester: AASM; 2005. p. 54.
4. American Academy of Sleep Medicine. The International Classification of Sleep Disorders, Third Edition (ICSD-3). Westchester: AASM; 2014. p. 53-4.
5. On the rise and fall of the apnea-hypopnea index: A historical review and critical appraisal;Pevernagie;J Sleep Res,2020