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Ma, Q.-H. (1988). "Pseudocardinia" from Middle Jurassic Xinhe Formation, Shandan, Gansu, NW China. Acta Palaeontologica Sinica. 27(1): 64–74, 154–158.
Ma, Q.-H. (1988). "Pseudocardinia" from Middle Jurassic Xinhe Formation, Shandan, Gansu, NW China. Acta Palaeontologica Sinica. 27(1): 64–74, 154–158.