1. Ahrens, L. H.: Some observations on the uranium and thorium distributions in accessory zircons. Geochim. Cosmochim. Acta 29, 711–716 (1965).
2. Aldrich, L. T., Davis, G. L., James, J. L.: Ages of minerals from metamorphic and igneous rocks near Iron Mountain, Michigan. J. Petrol. 6, 445–472 (1965).
3. Althaus, E., Karotke, E., Nitsch, K. H., Winkler, H. G. F.: An experimental re-examination of the upper stability limit of muscovite plus quartz. Neues Jahrb. Mineral. Monatsh. 7, 325–336 (1970).
4. Barth, T. F. W., Dons, J. A.: Precambrian of southern Norway. In: Geology of Norway. Ed. P. Holtedahl. Norges Geol. Unders. 208, 6–67 (1960).
5. —, Reitan, P. H.: The Precambrian of Norway. In: The Precambrian. Ed. K. Rankama. London: Interscience 1963.