Lang Yan et al., 1999
From dinoflaj3
Lang Yan, He Chengquan, Wu Chunguang and Yang Guoqi, 1999: Early Cretaceous microphytoplankton from the Eren Basin, Nei Mongol, north China. Acta Micropalaeontologica Sinica, v.16, no.4, p.369-392, pl.1-6.