References
- Lindell, Sievert and Wahlberg (1950) Acta Radiol., 33, p. 344.
- Sievebt (1950) Acta Radiol., 33, p. 191.
- Sievebt (1933) Acta Radiol., 14, p. 597.
- Bossi, R. (1946) Ricerca Scientifica, 16:5, p. 622.
- Lindell, Stevert and Wahlberg (1950) Acta Radiol., 33, p. 344.