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Optics Applied. Nature 218, 911 (1968). https://doi.org/10.1038/218911a0
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DOI: https://doi.org/10.1038/218911a0
Nature volume 218, page 911 (1968)
Optics Applied. Nature 218, 911 (1968). https://doi.org/10.1038/218911a0
Issue Date:
DOI: https://doi.org/10.1038/218911a0