New discoveries of xenacanth sharks from the Late Carboniferous of Spain (Puertollano Basin) and Early Permian of Germany (Saar-Nahe Basin): Implications for the phylogeny of xenacanthiform and anacanthous sharks. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 205(1), 1–31
DOI: 10.1127/njgpa/205/1997/1
