	Authors	Year	Title
	Korn	1997	The Palaeozoic ammonoids of the South Portuguese Zone. Memórias do Instituto geológico e Mineiro 33: 1-131, 69 text-figs., 16 pls., Lisboa.
	Ruan	1988	Ammonoids. In: Yu Chang-min [ed.]: Devonian-Carboniferous Boundary in Nanbiancun, Guilin, China. Aspects and Records. 251-262, fig.78-81, tab.20, pl.64,65; Beijing (Science Press).