2011, Determination of barium in natural curative waters by ICP-OES technique. Part I. Waters taken on the area of health resorts in Poland 18. Februar 2020 Garboś S, Swiecicka D Rocz Panstw Zakl Hig. 2011;62(1):27-32 https://www.ncbi.nlm.nih.gov/pubmed/21735975