Díaz-Martínez, Enrique; Sanz-Rubio, Enrique; Martínez-Frías, Jesús (2002). "Sedimentary record of impact events in Spain". In Christian Koeberl; Kenneth G. MacLeod (eds.). Catastrophic events and mass extinctions: impacts and beyond. Geological Society of America. doi:10.1130/0-8137-2356-6.551. ISBN978-0-8137-2356-3.