Derycke, C. & Brice, D. & Blieck, A. & Mouravieff, N. (1995)
Upper Givetian and Frasnian ichthyoliths from Bas-Boulonnais (Pas-de-Calais, France): preliminary records.
Bulletin du Muséum National d'Histoire Naturelle, (Série 4), sect. C, 17(1–4), 487–511