Galactic Interaction Simulations
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Joshua Barnes:
http://www.ifa.hawaii.edu/faculty/barnes/transform.html
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John Dubinksi:
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http://www.cita.utoronto.ca/~dubinski/nbody/
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Chris Mihos:
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http://burro.astr.cwru.edu/models/models.html
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Bob Berrington (Wyoming):
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http://physics.uwyo.edu/~rberring/
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There are others�