A.  Lapeva-Gjonova, Antonova, V., and Ljubomirov, T., ?Ants (Hymenoptera, Formicidae) of Sarnena Sredna Gora Mountains (Bulgaria)?, in Georgiev, D., Bechev, D. & Yancheva, V. (Eds.) Fauna of Sarnena Sredna Gora Mts, Part 2, ZooNotes, vol. Supplement 10, Plovdiv University Press ?Paisii Hilendarski?, 2021, pp. 18-27.