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Francine Martin (1989)

Systematic Revision of Elektoriskos williereae and Dilatosphaera williereae (Acritarchs) and its Bearing on Silurian (Llandoverian) Stratigraphy.

Bulletin de l'Institut Royal des Sciences Naturelles de Belgique - Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen, 59:5-14.