References
- Rolf, Sievert M. (1933) Acta radiologica
- Holthusen-hamann (1932) Strahlentherap., pp. 43-667.
- Holthusen-hamann (1935)pp. 53-543.
- Sven, Benner (1933) Acta radiologica, p. 623.
- Sven, Benner (1935)p. 185.
- Schaefee, W. and Witte, E. (1933) Strahlentherap., p. 568.
- Jacobsen, I. C. and Johan, Ambrosen (1936) Acta radiologica, p. 252.
- Bell, G. W. C. C. E. and Binks, W. (1936) Strahlentherap., p. 670.
- Rolf, Sievert M. (1936) Strahlentherap., p. 354.