“Didgeridoo Playing as Alternative Treatment for Obstructive Sleep Apnea Syndrome: Randomized Controlled Trial,” Milo A. Puhan, Alex Suarez, et al. http://www.bmj.com/cgi/content/full/332/7536/266 (accessed July 13, 2009).

The didgeridoo modifications I’ve described (especially the dimpling and kinking) owe a huge debt to Steven L. Sachs; sadly, his didgeridoo website is no longer available online. I’ve archived portions at http://www.davideriknelson.com/sbsb/.