Qiao Xiuyun et al., 1992
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Qiao Xiuyun, He Chengquan and Gao Ruiqi, 1992: Early Cretaceous freshwater dinoflagellates from Songliao Basin, NE China. Acta Palaeontologica Sinica, v.31, no.1, p.30-38, pl.1-3. (In Chinese with English summary.)
