1. Red wood ants in Bulgaria: distribution and density related to habitat characteristics
2. The zoogeography of ants (Hymenoptera, Formicidae) in northern Europe. -;Baroni Urbani;Acta Zool. Fenn,1977
3. The Formicidae (Hymenoptera) of Fennoscandia and Denmark. -;Collingwood;Fauna Entomol. Scand,1979
4. Colonies of hybrids and mixed colonies; interspecific nest takeover in wood ants (Hymenoptera, Formicidae);Czechowski;Memorabilia Zool,1996