Yuan Deyan and He Chengquan, 1999
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Yuan Deyan and He Chengquan, 1999: Two new species of dinoflagellate cysts from the Upper Cretaceous Nenjiang Formation, southern Songliao Basin, NE China. Acta Micropalaeontologica Sinica, v.16, no.1, p.89-94, pl.1. (In Chinese with English summary.)