1. International Atomic Energy Agency,1984
2. International Atomic Energy Agency,1980
3. Elemental Analysis of Biological Materials;Guinn,1980
4. NAA as viewed from the perspective of international atomic energy agency intercomparison tests
5. R. Dybczynski, Relative accuracy, precision and frequency of use of neutron activation analysis and other techniques as revealed by the results of some recent IAEA intercomparisons, in ref. 1.