Die Kur - Kraft für Körper, Seele und den Alltag

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1996, Mineral water and spas in Bulgaria

Vassilewa S.

Clinics in Dermatology, Volume 14, Issue 6, November–December 1996, Pages 601-605

https://www.sciencedirect.com/science/article/pii/S0738081X96000909?via%3Dihub