Ziveri, P, de Bernardi, B, Baumann, KH, Stoll, HM and Mortyn, PG (2007) Sinking of coccolith carbonate and potential contribution to organic carbon ballasting in the deep ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 54(5-7). 659-675. doi:10.1016/j.dsr2.2007.01.006