Nielsen, K. B. (1917). Heliopora incrustans nov. sp. with a survey of the Octocorallia in the deposits of the Danian in Denmark. Meddelelser fra Dansk Geologisk Forening. 5(8): 1–13.
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Nielsen, K. B.
1917
Heliopora incrustans nov. sp. with a survey of the Octocorallia in the deposits of the Danian in Denmark