Authors Year Title
Becker 1996 New faunal records and holostratigraphic correlation of the Hasselbachtal D/C-Boundary Auxiliary Stratotype (Germany).
Annales Société géologique de Belgique 117 (1994): 19-45, 5 fig., 3 tabl., 3 pls., Bruxelles.
Czarnocki 1989 Klimenie Gór Swietokrzyskich.
Prace Panstw. Inst. Geol., 127: 1-91, fig.1-21, tab.1-3, pl.1-50; Warszawa.