Smith, A. B., Gallemí, J., Jeffery, C. H., Ernst, G. & Ward, P. D. 1999. Late Cretaceous-early Tertiary echinoids from northern Spain: implications for the Cretaceous-Tertiary extinction event. Bulletin of the Natural History Museum, Geology Series 55, 81-137.
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Smith, A. B.; Gallemí, J.; Jeffery, C. H.; Ernst, G.; Ward, P. D.
1999
Late Cretaceous-early Tertiary echinoids from northern Spain: implications for the Cretaceous-Tertiary extinction event
Bulletin of the Natural History Museum, Geology Series