Rift zones in the continental crust of Europe - geophysical, geological and geochemical evidence: Oslo-Horn Graben papers presented at the Symposium on "Rift Zones in the Continental Crust of Europe - Geophysical, Geological and Geochemical Evidence: Oslo-Horn Graben" held in Strasbourg, France, 20 - 23 March 1989 - Neumann, Else-Ragnhild (Elsevier, 1990)