The crystalline basement of Estonia: rock complexes of the Palaeoproterozoic Orosirian and Statherian and Mesoproterozoic Calymmian periods, and regional correlations,
Korsman, K., T. Koistinen, J. Kohonen, M. Wennerstr$\ddot{\rm o}$m, E. Ekdahl, M. Honkamo, H. Idman, Y. Pekkala (Eds.) (1997),
Bedrock Map of Finland, 1:1,000,000.