Krasheninnikov and Basov, 1983
From dinoflaj3
Krasheninnikov, V.A. and Basov, I.A., 1983: Cretaceous calasphaerulids of the Falkland Plateau, D.S.D.P. Leg 71. In: Ludwig, W.J. et al., Deep Sea Drilling Project, Washington, Initial Reports, v.71, p.977-997.