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Braunisch, Veronika; Vignali, Sergio; Oggier, Pierre-Alain; Arlettaz, Raphaël (2021). Present in the western European Alps but absent in the eastern part: Can habitat availability explain the differences in red-billed chough occurrence? Journal of avian biology, 52(4) Wiley 10.1111/jav.02682
Arlettaz, Raphaël; Oggier, Pierre-Alain (16 November 2021). Le Valais et ses grands prédateurs. Le Temps Le Temps
