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The file "Scheme_of_spontaneous_parametric_down-conversion.pdf" has 2 identical duplications.
- Scheme of spontaneous parametric down-conversion.pdf . . Maintenance script (talk | contribs) . . 06:29, 7 October 2022
- Scheme of spontaneous parametric down-conversion.pdf . . imagescommonswiki>Denysbondar . . 21:06, 3 October 2012
- Scheme of spontaneous parametric down-conversion.pdf . . wikimediacommons>Denysbondar . . 21:06, 3 October 2012