Weiß, B. M., Schloegl, C., & Scheiber, I. B. R. (2013). How to tell friend from
foe: Cognition in a complex society. In I. B. R. Scheiber, B. M. Weiß, J. Hemetsberger, & K. Kotrschal (Eds.),
The social life of greylag geese: Patterns, mechanisms and evolutionary function in an avian model
system (pp. 172-188). Cambridge: Cambridge Univ. Press.