References
- Berger (1936) Wien. klin. Wschr., 49, p. 1415.
- Berger (1938) Verhandl. d. Gesellsch. fur Verd. etc, Stuttgart
- Engel-Lysholm (1933) Acta med. scand., p. 34.
- Hammarsten and Ågren (1937) Acta med. scand., 92, p. 256.
- Katsch (1938)Stuttgart
- Lagerlof (1939) Quart. J. of. med., 32, p. 115.
- Svartz (1931) Acta med. scand., p. 198.
- Svartz (1936) Nord. med. Tidskr., 11, p. 930.
- Svartz (1938)Stuttgart
- Ågren and Lagerlof (1936) Acta med. scand., 90, p. 1.
- Ågren, Lagerlof and Berglund (1936) Acta med. scand., 90, p. 224.