1. Radon daughter concentrations in some coal, metal-ore and chemical elements mines;Domanski;Medycyna Pracy,1970
2. Concentrations of radon-222 in coal mines in England and Scotland;Duggan;Nature,1968
3. The exposure of United Kingdom miners to radon;Duggan;British J. Ind. Med.,1970
4. Reporting Data D-08-05;HASL (Health and Safety Laboratory),1983
5. Radiation protection of workers in mines;International Commission on Radiological Protection,1986