http://www.comercio.com.pe/com/tech/html/2004%2D08%2D18/quimica0180284.html

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http:// www.comercio.com.pe /ediciononline/html/2004-10-21/onllima0209433.html

http:// www.comercio.com.pe /edicionimpresa/html/2004-10-05/impvidayfuturo0202334.html

http:// www.comercio.com.pe /edicionimpresa/html/2004-09-05/impnacional0188285.html