Die Kur - Kraft für Körper, Seele und den Alltag
Hirak Behari Routh MB BS, Kazal Rekha Bhowmik MB, BS
Clinics in Dermatology
Volume 14, Issue 6, November–December 1996, Pages 549-550
https://www.sciencedirect.com/science/article/pii/S0738081X9600082X