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WikiPedia: Kalsium http://www.webelements.com/webelements/elements/te... http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://ods.od.nih.gov/factsheets/calcium.asp http://www.nal.usda.gov/fnic/foodcomp/Data/SR17/wt... http://en.wikipedia.org/wiki/Chemical_elements_dat... https://catalogue.bnf.fr/ark:/12148/cb11976285h https://data.bnf.fr/ark:/12148/cb11976285h https://id.loc.gov/authorities/subjects/sh85018768 https://d-nb.info/gnd/4069806-3 https://id.ndl.go.jp/auth/ndlna/00565069