1. Papp, J. F. and Bureau of Mines (1996),Mineral Industry Surveys: Chromium, Monthly, US Department of the Interior, Washington, D.C.
2. Turick, C. E., Apel, W. A., and Carmiol, N. S. (1996),Appl. Microbiol. Biotechnol. 44, 683–688.
3. Johnson, C. A. and Sigg, L. (1996), inMetal Compounds in Environment and Life, E. Meriam and W. Haerdi, Northwood, Charlottesville, NC,vol. 4, pp. 73–80.
4. Fendorf, S. E. and Sparks, D. L. (1994),Environ. Sci. Technol. 28, 290–297.
5. Mertz, W. (1975),Nutr. Rev. 33, 129–135.