	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.
	Nikolaeva & Kullmann	1995	The Late Namurian genus Cancelloceras (Carboniferous Ammonoidea) and its distribution. Paläontologische Zeitschrift 69: 353-376, 8 figs., 1 table, Stuttgart
	Oliveira, Horn & Paproth	1979	Preliminary note on the stratigraphy of the Baixo Alentejo Flysch Group, Carboniferous of Southern Portugal and on the palaeogeographic development, compared to corresponding units in Northwest Germ Comunicacoes dos Servicos de Portugal, 65: 151-168, fig.1-5, tab.1-2, pl.1-4; Lisboa.