G. M. Kendall, C. R. Muirhead, B. H. MacGibbon, J. A. O'Hagan, A. J. Conquest, A. A. Goodill, B. K. Butland, T. P. Fell, D. A. Jackson, M. A. Webb,
Mortality and occupational exposure to radiation: first analysis of the National Registry for Radiation Workers. BMJ. ,vol. 304, pp. 220- 225 ,(1992) ,
10.1136/BMJ.304.6821.220