Cramer and Diez, 1976
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Cramer, F.H. and Diez, M.del C. R., 1976: Acritarchs from the La Vid Shales (Emsian to lower Couvinian) at Colle, Léon, Spain. Palaeontographica, Abteilung B, v.158, no.1-4, p.72-103, pl.1-7.