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5. Atlavin, A. B., Dubinskaya, N. A. (Inst. of Biology, Riga, USSR): Instrumental neutron activation method for copper, zinc, and manganese determination in poultry feathers. Latv. PSR Zinat. Akad. Vestis No. 7, 1972, p. 58–62 (in Russian), see also Nucl. Sci. Abstr. 27 (1973). No. 7343.