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References
Hillier, J., and Ramberg, E. G., J. App. Phys., 18, 48 (1947).
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CHALLICE, C. Electron Microscopy Group of the Institute of Physics: Annual Conference. Nature 173, 340–341 (1954). https://doi.org/10.1038/173340a0
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DOI: https://doi.org/10.1038/173340a0