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2
by Nielsen, B.
Published in Acta Radiologica (1947)
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E-Article
5
7
by Nielsen, B.R.
Published in Europhysics News (1994)
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E-Article
8
by Nielsen, B., Snorrason, E.
Published in Acta Radiologica (1946)
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E-Article
10
11
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13
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