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    • ...an insurmountable hurdle to physicist Dirk Helbing's work, described by...
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  16. Special Features |

    • ...one are exactly what led Dirk Helbing, a physicist and the...
    Scientific American 305 , 52–57
  17. Comments and Opinion |

    • ...story covers the work of Dirk Helbing, a physicist and chair...
  18. Special Features |

    • ...one are exactly what led Dirk Helbing, a physicist and the...
    Scientific American 305 , 52–57
  19. Comments and Opinion |

    • ...story covers the work of Dirk Helbing, a physicist and chair...
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    • ...meltdowns, says physicist-turned-sociologist Dirk Helbing of the Swiss Federal Institute...
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