William W. Hay, K. M. Towe; Microrhabdulus belgicus, a new species of nannofossil. Micropaleontology ; 9 (1): 95. doi:
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"A species of Microrhabdulus, distinguished by evenly spaced cycles of subrhomboidal nodes, is described from Campanian chalk deposits at Folx-les-Caves, Belgium."
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