Vasilev, I.; Eftimov, M. 1975. The ants Formicidae (Hymenoptera) from the mountain of Lozen. [In Bulgarian.]. Godishnik na Sofiiskiya Universitet. Biologicheski Fakultet. Kniga 1. Zoologiya, Fiziologiya i Biohimiya na Zhivotnite 67:121-128.

Notes: Date signed for printing.