	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.
	Oliveira & Wagner-Gentis	1983	The Mértola and Mira formation boundary between Dogueno and Almada de Ouro, marine Carboniferous of South Portugal. Contr. Carboniferous Geol. Palaeont. Iberian Peninsula (Ed.: Lemos de Sousa,M.J.): 1-39, fig.1-14, pl.1-9; Porto.