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Brigitte Spillmann, - and LYNDA P. DUNKEL, - and Maria A. van Noordwijk, - and Rahmalia N. A. Amda, - and Adriano R. Lameira, - and Serge A. Wich§ & Carel P. van Schaik, - (2010) Acoustic Properties of Long Calls Given by Flanged Male Orang-Utans (Pongo pygmaeus wurmbii) Reflect Both Individual Identity and Context. international journal of behavioural biology/ethology, 116. pp. 385-395.