1. Cambrian high-resolution biostratigraphy and carbon isotope chemostratigraphy in Scania, Sweden: first record of the SPICE and DICE excursions in Scandinavia;Ahlberg;Lethaia,2009
2. Study of the Cambrian conodonts from north and northeastern China;An;Science Report of the Institute of Geosciences, Section B,1982
3. On evolution of Cambrian conodonts;An;Acta Palaeontologica Sinica,1994
4. The Conodonts of North China and Adjacent Regions;An,1983
5. Lower and Middle Cambrian of Sweden: Trilobites, Biostratigraphy and Intercontinental Correlation;Axheimer,2006