Authors Year Title
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.
Ruzhencev & Bogoslovskaya 1971a Namiurskii etap v evoliutsii ammonodei. Rannenamiurskie ammonoidei.
Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 133: 1-382, fig.1-89, pl.1-40; Moskva.