Bouloubassi, Ioanna; Rullkoetter, Juergen; Meyers, Philip A. (1999): Origin and transformation of organic matter in Pliocene-Pleistocene Mediterranean sapropels; organic geochemical evidence reviewed. Elsevier, Amsterdam, Netherlands, In: Rohling, Eelco J. (editor), Fifth decade of Mediterranean paleoclimate and sapropel studies, 153 (1-4), 177-197, georefid:1999-015186