Stockmans and Willière, 1962b
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Stockmans, F. and Willière, Y., 1962b: Hystrichosphères du Dévonien belge (Sondage de Wépion). Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie, v.71, no.1, p.83-99, pl.1-2.