Harper, H.; Hart, G. F. (1976): Statistical evaluation of the distribution of Miocene-Pliocene siliceous phytoplankton, D.S.D.P. Hole 71, equatorial Pacific. Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States, Journal of Paleontology, 50 (6), 1083-1089, georefid:1977-018345