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The authors are indebted to prof. J. Bačkovský for critical comments on this manuscript.
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Hrdý, J., Renner, O. Method of measuring x-ray tube focus. Czech J Phys 20, 1335–1336 (1970). https://doi.org/10.1007/BF01734726
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DOI: https://doi.org/10.1007/BF01734726