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F. H. Nielsen, D. R. Myron, S. H. Givand, and D. A. Ollerich, J. Nutr. 105,. 1607 (1975). ... W. E. Harris and B. Kratochvil, in Chemical Separation and Measurements, ... A. Cantarow and M. Trumper, in Lead Poisoning, Williams and Wilkins, Bal-.