<ref name="Kipyatkov_1997">{{cite book |first1=V. E. |last1=Kipyatkov |year=1997 |title=Proceedings of the International Colloquia on Social Insects. Volume 3-4 |url= |location=St. Petersburg |publisher=Russian Language Section of the IUSSI |pages=viii + 311 pp. |isbn=}}</ref>