1. W. BURTON, N. STEWART, Report AERE-HR/R-2084, 1960.
2. S. C. BLACK, Health Phys., 7 (1961) 87.
3. H. FRANCOIS et al., Compte Rendu du Colloque Franco-Yugoslave de Herceg Novi, 24–27 septembre 1963; quoted by: D. PANOV et al., VI-SFRP/50, Inst. of Occupational and Radiological Health, Beograd, Yugoslavia.
4. A. MARENCO et al., Chim. Anal., 50 (1968) 133.
5. S. ABE, M. ABE, Health Phys., 17 (1969) 340.