Villain, 1975
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Villain, J.-M., 1975: "Calcisphaerulidae" (incertae sedis) du Cretacé supérieur du Limbourg (Pays-Bas), et d'autres régions. Studies on "Calcisphaerulidae" (incertae sedis) from Upper Cretaceous of Limburg (Netherlands), and other regions. Palaeontographica, Abteilung A, v.149, p.193-242, pl.33-41.