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WikiPedia: Nhóm methyliden https://web.archive.org/web/20211010022335/http://... https://web.archive.org/web/20211010022335/http://... https://web.archive.org/web/20211106091241/https:/... https://web.archive.org/web/20211106091243/https:/... https://web.archive.org/web/20211106092713/https:/... https://old.iupac.org/reports/provisional/abstract... https://old.iupac.org/reports/provisional/abstract... https://old.iupac.org/reports/provisional/abstract... https://en.wiktionary.org/wiki/carbene https://en.wiktionary.org/wiki/methylene