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^Alain Dubois, and Jean Raffaelli, "A new ergotaxonomy of the order Urodela Dumeril, 1805 (Amphibia, Batrachia)," Alytes, Volume 28, Number 3-4, Paris, France, 2012, Pages 77-161.
^ abcdNikolya A. Poyarkov, Jr., Jing Che, Mi-sook Min, Makaki Kuro-o, Fang Yan, Cheng Li, Koji Iizuka & David R. Vieites, "Review of the systematics, morphology and distribution of Asian Clawed Salamanders, genus Onychodactylus (Amphibia, Caudata: Hynobiidae), with the description of four new species." Zootaxa, 3465, Auckland New Zealand, Magnolia press, 2012, Pages 1-106.