Chen & Erdtmann 1991. Lower Cambrian fossil Lagerstatte from Chengjiang, Yunnan, China: insights for reconstructing early metazoan life. 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, New York etc., 1991: 179-187. Chapter pagination: 57-76