R.  Kostova, Lazarov, S., Bekchiev, R., Goranov, S., Simov, N., and Beshkov, S., Soil and cave invertebrates from the village Gintsi area. Sofia: Association of Speleoclubs in Sofia, 2016, p. 116.

G.  Sabella and ?ima, A., ?Study on Tychini of Balkan Peninsula (Coleoptera, Staphylinidae, Pselaphinae)?, Zootaxa, vol. 4200, no. 4, p. 591, 2016.

R.  Bekchiev, ?The Pselaphinae (Coleoptera: Staphylinidae) of Bulgaria, version 1.2.?, 2016. [Online]. Available: http://pselaphinae-bg.myspecies.info. [Accessed: 2016-01-10].

P.  Beron, ?Terrestrial cave invertebrates of the Vrachanska Planina Mountains?, ZooNotes, vol. Supplement 3, no. Faunistic diversity of Vrachanski Balkan Nature Park, pp. 185-230, 2016.