Yu Jingxian et al., 1981
From dinoflaj3
Yu Jingxian, Sun Mongrong, Sun Suying and Mao Shaozhi, 1981: Dinoflagellates and acritarchs from Dalanshan Formation and their significance in explain the depositional environment. Oil and Gas Geology, v.2, no.3, p.254-264, pl.1. (In Chinese with English abstract.)