References
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- Crane, A. W. (1931) Americ. Journal of Roentgenology, 26, p. 92.
- Gråberger, G. (1931) Acta rad., 12, pp. 164-311.
- Laurell, H. (1939) Om rontgen vid akuta bukfall, Uppsala, p. 28.
- Lonnerblad, L. (1932) Acta rad., 13, p. 551.
- Schele, A. (1935) Acta rad., 15, p. 456.
- Waugh, J. M. (1937) The Proceedings of the Staffmeetings of the Mayo Clinic, p. 694.
- Wakefield, Vickers and Walters (1939) Surgery, 5, p. 670.