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Xiao, Z.-Z.; Yang, H.-L.; Shan, Q.-S. (1994). The Mesozoic Stratigraphy and Biota of Beijing Area. Geological Publishing House, Beijing.
Xiao, Z.-Z.; Yang, H.-L.; Shan, Q.-S. (1994). The Mesozoic Stratigraphy and Biota of Beijing Area. Geological Publishing House, Beijing.
