Die Kur - Kraft für Körper, Seele und den Alltag
Magalie Sabatier, Maurice J Arnaud, Peter Kastenmayer, Andreas Rytz, Denis V Barclay
The American Journal of Clinical Nutrition, Volume 75, Issue 1, January 2002, Pages 65–71,
https://academic.oup.com/ajcn/article/75/1/65/4689246