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WikiPedia: Tungsten //www.ncbi.nlm.nih.gov/pmc/articles/PMC5917440 //www.ncbi.nlm.nih.gov/pubmed/29707073 //doi.org/10.1080%2F14686996.2018.1455154 https://catalog.archives.gov/id/10641560 https://id.loc.gov/authorities/subjects/sh85138607 https://d-nb.info/gnd/4066862-9 https://www.nittan.co.jp/tech/all/detail01.html https://id.ndl.go.jp/auth/ndlna/00572649 https://babel.hathitrust.org/cgi/pt?id=nnc1.cu6125... https://babel.hathitrust.org/cgi/pt?id=nnc1.cu6125...