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– Chem web: http://www.chemweb.com/ – Chemedia: http://www.chemedia.com/ – Chemindustry: http://www.chemindustry.com/index.html – Polymer-Search: http://www.polymer-search.com/ – Sciseek: http://www.sciseek.com/ – About.com:Chemistry: http://chemistry.about.com/ – Chemie.DE: http://www.chemie.de/ – Quiminet: http://www.quiminet.com/ – Scirus: http://www.scirus.com/ – Chemdex: http://www.chemdex.org/ – Google libros: http://books.google.es/ – Google académico: http://scholar.google.es/Leer más