1. Paleomagnetism of Proterozoic and Palaeozoic dykes on Bornholm (Denmark);Abrahamsen
2. Late Proterozoic-Lower Paleozoic APWP for Bornholm (Denmark), and implications for drift of Baltica, EGS XIX General Assembly, Grenoble;Abrahamsen;Ann. Geophys.,1994
3. Paleomagnetism of Proterozoic dykes from Bornholm, Denmark;Abrahamsen;Geophys. J. Int.,1995
4. Borholms grundfjeld, Varv, 1988, 36–43 and 1989;Berthelsen
5. From Precambrian to Variscan Europe;Berthelsen,1992