Nicholas R. Longrich; David M. Martill; Brian Andres (2018). "Late Maastrichtian pterosaurs from North Africa and mass extinction of Pterosauria at the Cretaceous-Paleogene boundary". PLOS Biology.16 (3): e2001663. doi:10.1371/journal.pbio.2001663.
sciencemag.org
science.sciencemag.org
Renne, Paul R.; et al. (2013). "Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary". Science.339 (6120): 684–687. doi:10.1126/science.1230492
