Higgins, A., and J. Friderichsen. “Boundary Relationships Between Pre-Caledonian and Caledonian Lithostructural Units in the East Greenland Caledonides 72°-74°N”. Rapport Grønlands Geologiske Undersøgelse, vol. 95, Dec. 1979, pp. 87-90, doi:10.34194/rapggu.v95.7656.