Bond, D. P. G.; Wignall, P. B.; Joachimski, M. M.; Sun, Y.; Savov, I.; Grasby, S. E.; Beauchamp, B.; Blomeier, D. P. G. (14 de abril de 2015). «An abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and acidification». Geological Society of America Bulletin. 127 (9–10): 1411–1421. ISSN0016-7606. doi:10.1130/B31216.1
worldcat.org
Bond, D. P. G.; Wignall, P. B.; Joachimski, M. M.; Sun, Y.; Savov, I.; Grasby, S. E.; Beauchamp, B.; Blomeier, D. P. G. (14 de abril de 2015). «An abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and acidification». Geological Society of America Bulletin. 127 (9–10): 1411–1421. ISSN0016-7606. doi:10.1130/B31216.1