Robert E. Rubin, the former Treasury Secretary who is now a top official at Citigroup Inc., that established firms have a chance to maintain their dominance over Internet companies as the Web continues its breakneck global growth.

Though Internet-only firms have pioneered new business models, large incumbent firms are moving in, Mr. Rubin, chairman of Citigroup's executive committee and member of the office of the chairman, said in his keynote speech Thursday at the Internet World Fall 2000 conference in New York.

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