Becker, Ralph Thomas; Kaiser, Sandra Isabella; Aretz, Markus (2016). "Review of chrono-, litho- and biostratigraphy across the global Hangenberg Crisis and Devonian–Carboniferous Boundary". Geological Society, London, Special Publications. 423 (1): 355–386. Bibcode:2016GSLSP.423..355B. doi:10.1144/SP423.10. ISSN0305-8719. S2CID131491081.
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Becker, Ralph Thomas; Kaiser, Sandra Isabella; Aretz, Markus (2016). "Review of chrono-, litho- and biostratigraphy across the global Hangenberg Crisis and Devonian–Carboniferous Boundary". Geological Society, London, Special Publications. 423 (1): 355–386. Bibcode:2016GSLSP.423..355B. doi:10.1144/SP423.10. ISSN0305-8719. S2CID131491081.
Kaufmann, B.; Trapp, E.; Mezger, K. (2004). "The numerical age of the Upper Frasnian (Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany)". The Journal of Geology. 112 (4): 495–501. Bibcode:2004JG....112..495K. doi:10.1086/421077.
Becker, Ralph Thomas; Kaiser, Sandra Isabella; Aretz, Markus (2016). "Review of chrono-, litho- and biostratigraphy across the global Hangenberg Crisis and Devonian–Carboniferous Boundary". Geological Society, London, Special Publications. 423 (1): 355–386. Bibcode:2016GSLSP.423..355B. doi:10.1144/SP423.10. ISSN0305-8719. S2CID131491081.
Sandberg, C.A.; Morrow, J.R.; Ziegler, W. (2002). "Late Devonian sea-level changes, catastrophic events, and mass extinctions". In Koeberl, C.; MacLeod, K.G. (eds.). Catastrophic Events and Mass Extinctions: Impacts and Beyond: Boulder, Colorado(PDF). Special Paper. Vol. 356. Geological Society of America. pp. 473–487. Archived from the original on 2010-03-26.{{cite book}}: CS1 maint: bot: original URL status unknown (link)
Becker, Ralph Thomas; Kaiser, Sandra Isabella; Aretz, Markus (2016). "Review of chrono-, litho- and biostratigraphy across the global Hangenberg Crisis and Devonian–Carboniferous Boundary". Geological Society, London, Special Publications. 423 (1): 355–386. Bibcode:2016GSLSP.423..355B. doi:10.1144/SP423.10. ISSN0305-8719. S2CID131491081.
