References
- Albers-Schonberg and Assman, H. (1934) Klinische Rontgendiagnostik der inneren Erkrankungen, Vogel, Berlin
- Barsony, T. and Koppenstein, E. (1930) Rontgenpraxis, 2, pp. 822-828.
- Idem (1930) Beitr. z. Klin. d. Tuberk., 74, pp. 566-577.
- Ferrari, B. (1937) Boll. Soc. med.-chir., Pavia, 51, pp. 391-400.
- Fleischner, F. (1926) Erg. Med. Strahlenforsch, 2, pp. 197-248. Assman, Gabert
- Thorell, I. (1933) Svensk Lakartidn., 30, p. 229.
- Torelli, G. (1932) Lolla contro la Tuberc., 3, p. 211.
- Twining, E. V. (1937) Brit. J. Radiol., 10, pp. 123-131.