Haszprunar, Gerhard, Rieger, Reinhard M. and Schuchert, Peter 1991. Extant 'Problematica' within or near Metazoa, in A.M. Simonetta and S. Conway Morris eds., The early evolution of Metazoa and the significance of problematic taxa. Proceedings of an International Symposium held at the University of Camerino, March 27-31, 1989: Cambridge, Cambridge University Press, p. 99-105.
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Haszprunar, G.; Rieger, R. M.; Schuchert, P.
1991
The early evolution of Metazoa and the significance of problematic taxa
Proceedings of an International Symposium held at the University of Camerino