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Sigma Sigmar Gabriel Sigma Octantis Sigma Sagittarii Sigma Leonis Sigma Aquilae Sigma Pegasi Sigmaringen Sigma-Aldrich Sigma CorporationTài liệu tham khảo
WikiPedia: Sigma-Aldrich http://news.emdgroup.com/N/0/553D2351699994CBC1257... http://www.emdmillipore.com/US/en/about-us/FYib.qB... http://www.merckmillipore.com/DE/en/about-us/news-... http://www.sigma-aldrich.com http://investor.sigmaaldrich.com/ https://web.archive.org/web/20160208120220/http://...