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Yeh H., 1988: The early records of fossil turtles from China. 6 pp. [REP 106] Acta zoologica cracoviensia 31/12: 451-456.
Young G. C., 1999: Preliminary report on the biostratigraphy of new placoderm discoveries in the Hervey group (Upper Devonian) of central New South Wales. 12 pp. Records of the Western Australian Museum 57: 139-150.
Yu-Hua X., 1993: A new species of Ptychozone (Gastropoda) from the Late Ordovician of Qinghai, Northwest China. 4 pp. (in English). Bolletino del Museo regionale di Scienze Naturali – Torino 11(2): 273-276.