1. Friedmann, H. Radon in Austria. In: Proceedings of the Fifth International Conference on High Levels of Natural Radiation and Radon Areas: Radiation Dose and Health effects, Munich, Germany, 4–7 September 2000. Bukart, W., Shorabi, M. and Bayer, A., Eds., (Salzgitter, Bundesamt für Strahlenschutz) p. 162 (2002).
2. Roth, S., Kies, A., Minten, V. and Feide, M. A review of indoor radon level in Luxembourg. In: Proceedings of the Fifth International Conference on High Levels of Natural Radiation and Radon Areas: Radiation Dose and Health effects, Munich, Germany, 4–7 September 2000. Bukart, W., Shorabi, M. and Bayer, A., Eds., (Salzgitter, Bundesamt für Strahlenschutz) p. 204 (2002).
3. Iakovleva, V. S. and Karataev, V. D. Radon levels in Tomsk dwellings and correlation with factors of impact. Radiat. Meas.34, 501–504 (2001).
4. Espinosa, G., Golarri, J. I., Rickards, R. and Gammage, R. B. Distribution of indoor radon levels in Mexico. Radiat. Meas.31, 355–358 (1999).
5. Canoba, A. et al. Indoor radon measurements and methodologies in Latin American countries. Radiat. Meas.34, 483–486 (2001).