Koizumi, I. (1975): Neogene diatoms from the northwestern Pacific Ocean, Deep Sea Drilling Project. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, Initial Reports of the Deep Sea Drilling Project, 32 (Hakodate, Japan to Honolulu, Hawaii, Aug.-Oct., 1973), 865-889, georefid:1976-009743