Harwood, D. and Gersonde, R. (1990) Lower Cretaceous diatoms from ODP Leg 113 Site 693 (Weddell Sea) Part 2: Resting spores, chrysophycean cysts, an endoskeletal dinoflagellate, and notes on the origin of diatoms. Proceedings of the Ocean Drilling Program, Scientific Results 113: 403-425.
