Robert Marcus, H. Jay Melosh, and Gareth Collins (2010). "Earth Impact Effects Program". Imperial College London / Purdue University. Hentet 2013-02-09.{{cite web}}: CS1-vedligeholdelse: Flere navne: authors list (link) (solution using 45 meters, 2600 kg/m3, 12.7 km/s, 45 degrees)