Zhou & Zhang 1984. Uppermost Cambrian and lowest Ordovician trilobites of North and North-East China. Nanjing Institute of Geology and Palaeontology, [Ed]. Stratigraphy and palaeontology of systemic boundaries in China. Cambrian-Ordovician boundary (2)., Anhui Science and Technology Publishing House, Anhui, 1984: 1-412. Chapter pagination: 63-193