熱水泉
↑ Eiko Yabauuchi, Kunio Agata (2004). “An outbreak of legionellosis in a new facility of hot spring Bath in Hiuga City”. Kansenshogaku zasshi 78 (2): 90–8. ISSN 0387-5911. PMID 15103899.
↑ Häring M, Rachel R, Peng X, Garrett RA, Prangishvili D (August 2005). “Viral diversity in hot springs of Pozzuoli, Italy, and characterization of a unique archaeal virus, Acidianus bottle-shaped virus, from a new family, the Ampullaviridae”. J. Virol. 79 (15): 9904–11. doi:10.1128/JVI.79.15.9904-9911.2005. PMC 1181580. PMID 16014951. http://jvi.asm.org/cgi/pmidlookup?view=long&pmid=16014951.
↑ Spa: Belgium's healthy-living retreat, Gareth Bourne and Sarah Hajibagheri, The Independent, November 3, 2006
↑ Tourist wash in one of hot spings Kamchatka