Hultberg, 1985a
From dinoflaj3
Hultberg, S.U., 1985a: Pithonella organica - a new calcareous dinoflagellate with an inner organic wall. In: Hultberg, S.U., Dinoflagellate Studies of the Upper Maastrichtian and Danian in Southern Scandinavia, p.24-32; Department of Geology, University of Stockholm, Stockholm, Sweden. (Published thesis.)