1. Arni P (1967) A comprehensive graph of the essential diagnostics of the Nummulites. Micropaleontology 13:41–54
2. Barnett RS (1974) An application of numerical taxonomy to the classification of the Nummulitidae (Foraminiferida). J Paleontol 48:1249–1263
3. Blondeau A (1972) Les Nummulites. Vuibert, Paris
4. Bookstein FL (1991) Morphometric tools for landmark data. Cambridge University Press, Cambridge
5. Bookstein FL, Reyment RA (1989) Microevolution in Brizalina studied by canonical variate analysis and analysis of landmarks. Bull Math Biol 51:657–679