1. Degens, E. T. & Ross, D. A. (eds) The Black Sea—Geology, Chemistry and Biology (Am. Ass. Petrol. Geol.,Tulsa, 1974).
2. Deuser, W. G. Deep-Sea Res. 18, 995–1004 (1971).
3. Degens, E. T. Am. Ass. Petrol. Geol. Mem 20, 296–307 (1974).
4. Degens E. T., Michaelis W., Mopper, K. & Kempe, S. Neues Jb. Geol. Paläont., Mh. (in the press).
5. Rona, E. & Joensu O. Am. Ass. Petrol. Geol. Mem. 20, 570–572 (1974).