Reference
Alfred Buschinger, Birgit C. Schlick-Steiner, Florian M. Steiner, Xavier Espadaler (2003): On the geographic distribution of queen polymorphism in Myrmecina graminicola (Hymenoptera: Formicidae). – Myrmecological News = Myrmecologische Nachrichten – 005: 37 - 41.