Smith, M. P., J. A. Rasmussen, S. Robertson, A. K. Higgins, and A. G. Leslie. “Lower Palaeozoic Stratigraphy of the East Greenland Caledonides”. GEUS Bulletin, vol. 6, Dec. 2004, pp. 5-28, doi:10.34194/geusb.v6.4815.