[1]
Kresten Nielsen, J. and Hanken, N.-M. 2002. Late Permian carbonate concretions in the marine siliciclastic sediments of the Ravnefjeld Formation, East Greenland. Geology of Greenland Survey Bulletin. 191, (Dec. 2002), 126–132. DOI:https://doi.org/10.34194/ggub.v191.5140.