Allart P Van Viersen and Harald Prescher (2010)
Taxonomy and biostratigraphy of some proetid trilobites in the Middle Devonian of the Ardennes and Eifel (Rhenohercynian Zone).
Bulletin de l'Institut royal des Sciences naturelles de Belgique,Sciences de la Terre, vol. 80 p. 5-45.
16322, 194, Lx, SYNDIN, CO, PAL
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