"Rare Earths Common in Body"(PDF). Rare-Earth Information Center News. Vol. IV, no. 1. Ames, Iowa. Iowa State University. March 1, 1969. p. 2. Retrieved 27 November 2018.
Niinistö, L. (2000). "Erämetsä, Olavi (1906-1974)". Suomen kemian historia (History of Finnish Chemistry. Helsinki: Finnish Literature Society. Retrieved 27 November 2018.
nih.gov
pubmed.ncbi.nlm.nih.gov
Erämetsä, O; Sihvonen, ML (1971). "Rare earths in the human body. II. Yttrium and lanthanides in the spleen". Annales medicinae experimentalis et biologiae Fenniae. 49 (1): 35–7. PMID5576240.
Erämetsä, O; Sihvonen, ML; Forssén, A (1968). "Rare earths in the human body. I. Yttrium". Annales medicinae experimentalis et biologiae Fenniae. 46 (2): 179–84. PMID5753710.
Punsar, Sven; Erämetsä, Olavi; Karvonen, Martti J.; Ryhänen, Aulis; Hilska, Päivi; Vornamo, Hannu (June 1975). "Coronary heart disease and drinking water". Journal of Chronic Diseases. 28 (5–6): 259–287. doi:10.1016/0021-9681(75)90009-0. PMID1141423.
Parker, John G. (1969). "Rare-earth minerals and metals"(PDF). Bureau of Mines / Minerals Yearbook Metals, Minerals, and Fuels 1969. 1–2: 951–958. Retrieved 27 November 2018.