References
- Thoræus Acta Radiol., p. 34.
- Thoræus (1935) Acta Radiol., p. 170.
- Quimby and Marinelli Radiology, p. 23.
- X-Ray Research and Development, published by N. V. Philips' Gloeilampenfabrieken, p. 173. Eindhoven, Holland
- Thoræus (1936) Acta Radiol., p. 161.
- Williams Radiology, p. 749.