Brassell, S.; Farrimond, P. (1986): Fluctuations in biological marker compositions within a Cenomanian black shale from the Angola Basin. Geologisches Staatsinstitut, Hamburg, Federal Republic of Germany, In: Degens, E. T., Meyers, P. A., Brasell, S. C., Biogeochemistry of black shales; case studies from a workshop, 60, 311-338, georefid:1988-051006