KÉHAR, HTML code: Ota. Astronomia - astronomický server fakulty pedagogické ZČU [online]. Plzeň: Astronomia, 2006-01-01 [cit. 2018-04-03]. Dostupné online.
doi.org
Michael R. Rampino & Ken Caldeira (2017). Correlation of the largest craters, stratigraphic impact signatures, and extinction events over the past 250 Myr. Geoscience Frontiers8(6): 1241-1245. doi: https://doi.org/10.1016/j.gsf.2017.03.002