1. R. E. Wainerdi, M. P. Menon, Proc. Symp. on Nuclear Activation Techniques in the Life Sciences IAEA, Vienna, 1967, p. 33.
2. A. F. Voigt, D. E. Becknell, Sr. L. Menapace, Proc. Intern. Conf. on Modern Trends in Activation Analysis, J. R. De Voe (Ed.), National Bureau of Standards Spec. Publ. 312, 1969, p. 1035.
3. D. N. Edgington, H. F. Lucas, Jr., Proc. Conf. on Nuclear Techniques in Environmental Pollution, IAEA, Vienna, 1971, p. 311.
4. D. F. Covell, Anal. Chem., 31 (1959) 1785.
5. St. Sterliński, Anal. Chem., 40 (1968) 1995.