Tunguska event

References

• Chyba, Christopher F., Paul J. Thomas, and Kevin J. Zahnle. "The 1908 Tunguska Explosion: Atmospheric Disruption of a Stony Asteroid." Nature 361.6407 (1993): 40-44. Print.
• Sekanina, Zdenek. "The Tunguska Event: No Cometary Signature in Evidence." The Astronomical Journal 88.9 (1983): 1382-412. Print.