The crystalline basement of Estonia: rock complexes of the Palaeoproterozoic Orosirian and Statherian and Mesoproterozoic Calymmian periods, and regional correlations,
Korhonen, J. V., S. Aaro, T. All, H. Nevanlinna, J. R. Skilbrei, H. Saavuori, R.Vaher, L. Zhdanova, T. Koistenen (2002b),
Magnetic Anomaly Map of the Fennoscandian Shield. Scale 1:2,000,000.