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Cheng, L.-R. (2000). Discovery and significance of the members of the Allotrioceratidae from Ordovician Qinhuangdao region, Hebei, North China. Acta Palaeontologica Sinica. 39(3): 396-402.
Cheng, L.-R. (2000). Discovery and significance of the members of the Allotrioceratidae from Ordovician Qinhuangdao region, Hebei, North China. Acta Palaeontologica Sinica. 39(3): 396-402.