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3. Why are there so many threat displays?;Andersson;J. Theor. Biol.,1980
4. B. Arano, (1988). Aspectos filogeneticos del genero Triturus con especial consideraction a la evolucion del complejo Triturus alpestris. Doctoral thesis, Universidad Complutense de Madrid.
5. “A Field Guide to the Reptiles and Amphibians of Britain and Europe”;Arnold,1978