|
Xu & Wei |
1977 |
Fossil Atlas of South-Central China, part 2, Cephalopoda. [In Chinese.]
Yichang Institute of Geology and Mineral Resources 1977: p.537-582, pl.204-218, (Geological Publishing House).
|
|
|
Xu |
1979 |
Late Lower Permian strata and ammonoids in Central Guangdong. [In Chinese].
Contributions to Stratigraphy and Palaeontology, Yichang Institute of Geology and Mineral Resources 1979: 34-45, 3 fig., 1 pl.
|