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(en) Alberti H., Groos-Uffenorde H., Streel M., Uffenorde H. & Walliser O.H., 1974. The stratigraphical significance of the Protognathodus fauna from Stockum (Devonian/Carboniferous boundary, Rhenish Schiefergebirge). Newsletters on Stratigraphy, 1 Oct. 1974, Volume 3, Number 4, pages 263-276.
(en) Walliser O.H., 2012. Global Events and Event Stratigraphy in the Phanerozoic: Results of the International Interdisciplinary Cooperation in the IGCP-Project 216 “Global Biological Events in Earth History”. Springer Science & Business Media, 6 déc. 2012 - 333 pages.