Russian site of official warning of a rocket test, prohibiting navigation in the area until 15 Dec. New Russian missile failure sparks UFO frenzy互联网档案馆的存檔,存档日期6
(原始内容存档于2020-07-27). Billion-Ton Comet May Have Missed Earth by a Few Hundred Kilometers in 1883. MIT Technology Review. 17 October 2011 [19 October 2011]. (原始内容存档于2012-05-17)