References
- Atta, Van and Northrup Am. J. of Rontg., p. 633.
- Bouwers and van der Tuuk (1939) Brit. J. of Radiol., p. 658.
- Clarkson and Mayneord (1938) Brit. J. of Radiol, 12, p. 168.
- Corrigan (1940) Radiol, 34, p. 8.
- Hudson, Cramer (1939) Radiol, 32, p. 530.
- Graf and Graf (1938) Strahlenther, 62, p. 538.
- Phillips and Innes (1938) Brit. J. of Radiol, 11, p. 498.
- Randall (1937) Amer. J. of Roentg, 38, p. 903.
- Stone and Aebersold (1937) Radiol, 29, p. 296.