Klaver, Gerard T.; van Kempen, Theo M. G.; Bianchi, Frans R.; van der Gaast, Sjerry (1987): Green spherules as indicators of the Cretaceous/Tertiary boundary in Deep Sea Drilling Project Hole 603B. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: van Hinte, Jan E., Wise, Sherwood W., Jr., Biart, Brian N. M., Covington, J. Mitchener, Dunn, Dean A., Haggerty, Janet A., Johns, Mark W., Meyers, Philip A., Moullade, Michel R., Muza, Jay P., Ogg, James G., Okamura, Makoto, Sarti, Massimo, von Rad, Ulrich, Blakeslee, Jan H. (editor), Whalen, Elizabeth (editor), Initial reports of the Deep Sea Drilling Project covering Leg 93 of the cruises of the drilling vessel Glomar Challenger, Norfolk, Virginia, to Norfolk, Virginia, May-June, 1983, 93 (1-2), 1039-1056, georefid:1987-061789