Steiner, Florian M., Schlick-Steiner, Birgit C., Moder, Karl, Stauffer, Christian, Arthofer, Wolfgang, Buschinger, Alfred, Espadaler, Xavier, Christian, Erhard, Einfinger, Katrin, Lorbeer, Eberhard, Schafellner, Christa, Ayasse, Manfred, and Crozier, Ross H. (2007) Abandoning aggression but maintaining self-nonself discrimination as a first stage in ant supercolony formation. Current Biology, 17 (21). pp. 1903-1907.