1. Lindstrom M., Puura V., Floden T., Bruun A. (1992). Ordovician impacts at sea in Baltoscandia . Pap. Present. Int. Conf. Large Meteorite Impacts and Planet. Evol., Sudbury, Aug. 31 - Sept. 2, 1992 , Houston (Tex.), P. 47
  2. Grahn Yngve, Nolvak Jaak (1993). Chitinozoan dating of Ordovician impact events in Sweden and Estonia. A preliminary note. Geol. foren. Stockholm forhandl., Vol.115, No.3, P. 263-264
  3. Moilanen Jarmo (2004). References.
  4. Spray John G. , Director PASSC (2005). Impact Structures listed by Name. Current total number of confirmed impact structures: 172.
  5. Osinski Gordon R. (2006). The geological record of meteorite impacts. 40th ESLAB First International Conference on Impact Cratering in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands


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