Qiao Xiuyun et al., 1992
From dinoflaj3
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.)