References
- Brewster
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- Hasselwander, A. (1954) Die objektive Stereoskopie an Rontgenbildern, G. Thieme Verlag, Stuttgart
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- Kugelberg, I. Avståndsbedomning och den plastiska avbildningen (Swedish), Tekniska Hogskolan, Stockholm
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- Sjogren, S. E.
- Watson, W. (1941) A monocular prismatic stereoscope. Radiography, 7, p. 25.