Schrader, H. J. (1979): Opal phytoplankton in DSDP Leg 49 samples. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Luyendyk, B. P., Cann, J. R., Duffield, W. A., Faller, A. M., Kobayashi, K., Poore, R. Z., Roberts, W. P., Sharman, G., Shor, A. N., Steiner, M., Steinmetz, J. C., Varet, J., Vennum, W., Wood, D. A., Zolotarev, B. P., Shambach, J. D. (editor), Initial reports of the Deep Sea Drilling Project covering Leg 49 of the cruises of the Drilling Vessel Glomar Challenger; Aberdeen, Scotland to Funchal, Madeira, July-September 1976, 49, 589-593, georefid:1980-054108