(link) Stewart S.A. y Allen P.J. (2002). «A 20-km-diameter multi-ringed impactstructure in the North Sea». Nature. 418 (6897): 520–523. PMID 12152076 Stewart
(julho de 2012). «Searching for giant, ancient impactstructures on Earth: The Mesoarchaean Maniitsoq structure, West Greenland». Earth and Planetary Science
considerada a sexta maior cratera de impacto confirmada na Terra, quando medida de borda a borda. «ImpactStructures listed by Diameter (Increasing)». PASSC