References
- Aston, G. H. and Attix, F. H. (1956) An intercomparison of the roentgen standards of Great Britain and U.S. A. Acta radiol, 46, p. 747.
- Thoraeus, R. (1954) Status of roentgen ray standards in Sweden, and a brief report on the first part of an inter-comparison between national roentgen ray standards. Acta radiol, p. 33.
- Thoraeus, R. , Oosterkamp, W. J. , Proper, J. , Jaeger, R. , Rajewsky, B. , Bunde, E. , Dorneich, M. , Lang, D. and Sewkor, A. (1955) Vergleichmessungen des internationalen «rontgen» im Bereich von 8 kV bis 170 kV Erzeugungsspannung. Strahlentherapie, 98, p. 265.
- Wyckoff, H. O. and Aston, G. H. (1954) Comparison of X-ray Standards. Acta radiol, p. 17.