Ujiie, H. (1975): Planktonic foraminiferal biostratigraphy in the western Philippine Sea, Leg 31 of DSDP. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, Initial Reports of the Deep Sea Drilling Project, 31 (Apra, Guam to Hakodate, Japan; June-August 1973), 677-691, georefid:1976-018649