Analysis of information sources in references of the Wikipedia article "Вилијам Крукс" in Serbian language version.
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(помоћ); reprinted in: Crookes, William (април 1861). „XLVI. On the existence of a new element, probably of the sulphur group”. Philosophical Magazine. 21 (140): 301—305. doi:10.1080/14786446108643058.|title=
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