1. Environmental radiation: a cause for concern?;Godlee, F.;BMJ,1992
2. Patient dose reduction in diagnostic radiology;Board, National Radiological Protection; of Radiologists, Royal College,3.)
3. Unnecessary x ray examinations;Bransley-Zachary, M.A.P.; Sutherland, G.R.;BMJ,1989
4. Reducing radiation exposure of patients;Gifford, D.;BMJ,1990
5. Unnecessary x rays blamed for up to 250 deaths a year;Hawkes, N.,1990