1. Espenson, J. H. Perchlorate in the Environment; Urbansky E., Ed.; Environmental Science Research, Vol. 57; Kluwer Academic Publishers, NY, 2000, p. 4.
2. Schilt, A. A. Perchloric Acid and Perchlorates; GFS Chemicals Publication, 1979, p. 17. (2nd edition in press)
3. Smith, G. F. The Wet Chemical Oxidation of Organic Compositions Employing Perchloric Acid With or Without Added NHO3, H5IO6, H2SO4; GFS Chemicals Publication, 1965, p. 23.
4. Idem, ibid. p. 19.
5. Kelly, R. J. Chem. Health Safety, 2000, 7(3), 5.