Hay, W. W. (1970): Calcareous nannofossils from cores recovered on leg 4, Chapter 23. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Bader, R. G., Initial reports of the Deep Sea Drilling Project; v. 4, Leg 4 of cruises of Glomar Challenger, Rio de Janeiro, Brazil, to San Cristobal, Panama, Feb.-Mar. 1969, 4, 455-501, georefid:1970-038956