المؤلفون: Walker, Nathan A, Sunderram, Jag, Zhang, Peng, Lu, Shou-en, Scharf, Matthew T^{Aff1, Aff2}

المصدر: Sleep and Breathing: International Journal of the Science and Practice of Sleep Medicine. 24(4):1759-1765

المؤلفون: Scharf, Matthew T., Kelz, Max B.

المصدر: Current Anesthesiology Reports. March 2013 3(1):1-9