Janssen, Nico M. M.
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Vol 86, No 1 (2016) - Articles
Ontogeny and variability in ribbing of Late Valanginian lamellaptychi (Ammonitina)
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Vol 86, No 3 (2016) - Articles
Aptychi from the Berriasian/Valanginian (France and Spain): new stratigraphical and morphological details
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