TY - ICOMM AU - Ripple, Dean AU - Pokhodun, Anatoly AU - Steur, Peter AU - Strouse, Gregory C1 - http://www.bipm.org C2 - website of the International Bureau of Weights and Measures DA - 2008-08-18 LA - en PB - website of the International Bureau of Weights and Measures PY - 2008 TI - Recommended List of Common Impurities for Metallic Fixed-point Materials of the ITS-90 UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=832299 ER -