ERNST, GUNDOLF - Biometrische Untersuchungen über die Ontogenie und Phylogenie der Offaster/Galeola-Stammesreihe (Echin.) aus der nordwesteuropäischen Oberkreide.

1971. N. Jb. Geol. Paläont. Abh. 139-2; pp. 169-225, 23 fig. incl. 3 plts. Orig. extract, stapled, very good.

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