1. Radiation Protection [Russian translation], ICRP Publ. No. 26, Atomizdat Moscow (1978).
2. Exposure to Radiation from the Natural Radiativity in Building Materials, Report by NEA Group of Exports, Paris, NEA OECD (1979).
3. É. M. Krisyuk et al., Prib. Tekh. Eksp., No. 5, 33 (1975).
4. R. Sievert and B. Hultquist, Acta Radiol.,37, 388 (1952).
5. W. Kolb and U. Lauterbach, in: Rapid Methods for Measuring Radiactivity in the Environment, Vienna, IAEA (1971), p. 565.