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Schoch, Rainer R. (1997-11-14). "Cranial anatomy of the Permian temnospondyl amphibian Zatrachys serratus Cope 1878, and the phylogenetic position of the Zatrachydidae". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 206 (2): 223–248. doi:10.1127/njgpa/206/1997/223. ISSN0077-7749.
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