Risk of massive asteroid strike underestimated

@article{Schiermeier2013RiskOM,
  title={Risk of massive asteroid strike underestimated},
  author={Q. Schiermeier},
  journal={Nature},
  year={2013}
}
Meteor in Chelyabinsk impact was twice as heavy as initially thought. 
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References

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A three-dimensional simulation of the 15 February airburst over Chelyabinsk, Russia
  • 2013
Mark Boslough & Brad Carvey A three-dimensional simulation of the 15 February airburst over Chelyabinsk