Petrographic and geochemical characterization of the Pergamon Altar (Telephos Frieze) marble in the Pergamon Museum, Berlin - Cramer, Thomas (ASMOSIA, 6. Interdisciplinary studies on ancient stone. Proceedings of the Sixth International Conference of the Association for the Study of Marble and Other Stones in Antiquity. Venice, June 15-18 2000, 2002)