References
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- Altman, W. S. (1946) Custom made film identification marker. Am. J. Roentgenol, 55, p. 664.
- Ashwin, C. (1941) Actinic film-marking. Radiography, 7, p. 6.
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- Kjellberg, S. R. (1939) Ein neuer Typus eines Filmmerkungsapparates. Acta radiol, 20, p. 253.
- Mattsson, O. (1952) Automatic counting of radiographs — an aid in processing control. Acta radiol, 38, p. 215.