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3. Deutsche Forschungsgemeinschaft (DFG), Volatile inorganic acids (HCL, HBr, HNO3), in Analyses of hazardous substances in air, ed. A. Kettrup, Wiley-VCH Verlag, Weinheim, Germany, 2002, vol. 6, ISBN 3 527 27053 1
4. US National Institute of Occupational Safety and Health (NIOSH), Method 7903-Acids, Inorganic, in NIOSH Manual of Analytical Methods, DHHS (NIOSH) publication 94–113, 4th edn., 1994, http://www.cdc.gov/niosh/nmam/