References
- Dittmar, O. (1932) Eontgenpraxis, 4, p. 442.
- Grashey, R. (1933) Rontgenpraxis, 5, p. 700.
- Hippe, H. U. and Hahle, K. (1936) Rontgenpraxis, 8, p. 98.
- Krogdahl, T. (1939) Nordisk Medicin, 1, p. 862.
- Lohr and Hellpap, R. U. W. (1938) Fortschr. Rontgenstr., 58, p. 45.
- Magnusson, W. (1937) Acta radiol., 18, p. 733.
- Nordheim, Y. (1938) Fortschr. Rontgenstr., 57, p. 479.
- Pannewitz, V. (1933) Rontgenpraxis., 5, p. 809.
- Widman, P. U. and Stecher, B. W. R. (1936) Radiology, 28, p. 541.