V.  Antonova, ?Compound nests and mixed colonies of ant species (Hymenoptera, Formicidae) in Sofia, Bulgaria?, in L. Penev, J. Niemelä, D. J. Kotze & N. Chipev (Eds.). Ecology of the City of Sofia. Species and Communities in an Urban Environment, 2004, pp. 423?428.

A.  Lapeva-Gjonova and Atanasova, M., ?A Faunistic Investigation of the Ants (Hymenoptera, Formicidae) in the City of Sofia?, in L. Penev, J. Niemelä, D. J. Kotze & N. Chipev (Eds.). Ecology of the City of Sofia. Species and Communities in an Urban Environment, Sofia-Moscow: Pensoft Publishers, 2004, pp. 417-422.

A.  Lapeva-Gjonova, ?Ants (Hymenoptera: Formicidae) from the Eastern Rhodopes (Bulgaria)?, in Beron P, Popov A (eds). Biodiversity of Bulgaria. 2. Biodiversity of Eastern Rhodopes (Bulgaria and Greece)., vol. 2, Sofia: Pensoft & Nat. Mus. Natur. Hist., 2004, pp. 507-513.