• http://www.hottopos.com

• http://chem-e.org/

• http://allchemy.iq.usp.br

• http://www.chm.davidson.edu/ChemistryApplets/index.html

• http://www.crq4.org.br

• http://www.abiquim.org.br

• http://www.brazchemicals.org.br

• http://www.pafko.com/history/h_whatis.html

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