Hultberg and Malmgren, 1985
From dinoflaj3
Hultberg, S.U. and Malmgren, B.A., 1985: Quantitative biostratigraphy based on Upper Maastrichtian dinoflagellates and planktonic foraminifera from southern Scandinavia. In: Hultberg, S.U., Dinoflagellate Studies of the Upper Maastrichtian and Danian in Southern Scandinavia, p.33-55; Department of Geology, University of Stockholm, Stockholm, Sweden. (Published thesis.)