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      "const": "Translated from Russian. Original: Herbert Niilisk, “Спектрофотометр для измерения спектральных потоков внутри посева”, Proceedings of the Academy of Sciences of the Estonian SSR. Physics, Mathematics and Technical Sciences Series, 1965, vol. 14 no. 4, pp. 528–533, https://doi.org/10.3176/phys.math.tech.1965.4.03. Published by Estonian Academy Publishers; license CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/) as deposited with Crossref by the publisher (the publisher's policy page names CC BY-NC 4.0). Changes: translated into English.",
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