1. "1. DURRANI, S.A., R.K. BULL, Solid State Nuclear Track Detection, Principles, Methods and Applications, First Edition, Pergamon Press, Oxford. 1987, pp. 169−173.
2. 2. EATON, R.S., Radon reduction, in: Radon and its Decay Products in Indoor Air, Chapter 2, W.W. Nazaroff, A.V. Nero, eds., John Wiley & Sons, New York, 1988, pp. 57-112.
3. 3. HPA, Radon and Public Health Report of the independent Advisory Group on Ionizing Radiation, 2009, RCE-11, 1−258.
4. 4. ICRP, Radiation protection of workers in mines, ICRP Publication 47, 16(1), 1986.
5. 5. JACOBI, W., The history of the radon problems in mines and homes, Annals of the ICRP, 1993, 23(2), 39−45.