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Asen Asenath Bole Odaga Asenapine Asenath Asendorf Asenovgrad Asen (định hướng) Asendorf, Harburg Asenovgrad (huyện) Asen trioxitTài liệu tham khảo
WikiPedia: Asen http://www.kfunigraz.ac.at/achwww/Seiten/englische... http://www.npi.gov.au/database/substance-info/prof... http://www.corrosionsource.com/handbook/periodic/3... http://web103.epnet.com http://www.macmillanscience.com/1403944997.htm http://www.usatoday.com/news/world/2007-08-30-5534... http://www.webelements.com/webelements/compounds/t... http://www.webelements.com/webelements/elements/te... http://www-cie.iarc.fr/htdocs/monographs/vol23/ars... http://www.atsdr.cdc.gov/csem/arsenic/