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Ruan |
1991 |
Lower Upper Carboniferous cephalopods of Nilka, Western Xinjiang.
Acta Paleontologica Sinica, 30 (2): 186-211, fig.1-24, pl.1-4; Beijing.
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|
Sheng |
1987 |
Carboniferous ammonoids from the Jingyuan district, Gansu.
Bull. Inst. Geol., Chinese Acad. Geol. Sci., 16: 143-193, fig.1-29, pl.1-5; Beijing.
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