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Nature 420, 349 (28 November 2002) | doi:10.1038/420349a

Open Innovation Challenges

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Visa clampdown hits home at US universities

Kendall Powell

Tighter immigration rules are causing a broad increase in visa delays and refusals for students and postdoctoral fellows seeking entry to the United States, two surveys show. And the problems are set to get worse in the new year, university officials say, when a scheme for tracking the students' movements is due to come into force.