Yu Jingxian et al., 1983
From dinoflaj3
Yu Jingxian, Guo Zhengying and Mao Shaozhi, 1983: Cretaceous palynological assemblages from the district south of the Songhua River. Chinese Academy of Geological Sciences, Professional Papers of Stratigraphy and Palaeontology, Geological Publishing House, Beijing, no.10, p.1-86, pl.1-30. (In Chinese with English abstract.)