Cramer et al., 1979
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Cramer, F.H., Diez, M.del C. R. and Kjellström, G., 1979: Acritarchs. In: Jaanusson, V., Laufeld, S. and Skoglund, R., Lower Wenlock faunal and floral dynamics - Vattenfallet section, Gotland. Sveriges Geologiska Undersökning, Serie C, no.762, p.39-53.