1. Yuan, J. and Zhao, Y. and Wang, Z. and (1997) A preliminary study on Lower-Middle Cambrian boundary and trilobite fauna at Balang, Taijiang, Guizhou, South China Acta Palaeontologica Sinica (in Chinese), 36(4), pp. 494 - 524.
2. Yuan, J. and Zhao, Y. and Li, Y. (2001a) Biostratigraphy of oryctocephalid trilobites Acta Palaontologia Sinica, 40(sup), pp. 143 - 156.
3. Yuan, J. and Zhao, Y. and Li, Y. (2001b) Notes on the classification and Phylogeny of oryctocephalids (Trilobita: Arthropoda) Acta Palaontologia Sinica, 40(Sup), pp. 214 - 226.
4. Yuan, J. and Zhao, Y. and Li, Y. and (2002) Trilobite fauna of the Kaili Formation (Uppermost Lower Cambrian-Lower Middle Cambrian) from Southeastern Guizhou' South China (in Chinese). In ( pp. 1 - 422 ). Shanghai : Shanghai Science and Technology Press.
5. Sundbert, F. and McCollum, L. (1997) Oryctocephalids (Corynexochida : Trilobita) of the Lower-Middle Cambrian boundary interval from California and Nevada Journal of Paleontology, 71(6), pp. 1065 - 1090.