Hou X.-g.; Bergström, J. (1991). The arthropods of the Lower Cambrian Chengjiang fauna, with relationships and evolutionary significance. In: Simonetta, A. M.; Conway Morris, S. (eds.) The early evolution of Metazoa and the significance of problematic taxa. Proceedings of an International Syposium held at the University of Camerino 27-31 March 1989. Cambridge University Press, Cambridge: 179–187.
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Hou X.-g.; Bergström, J.
1991
The arthropods of the Lower Cambrian Chengjiang fauna, with relationships and evolutionary significance. In: Simonetta, A. M.; Conway Morris, S. (eds.) The early evolution of Metazoa and the significance of problematic taxa. Proceedings of an International Syposium held at the University of Camerino 27-31 March 1989