W.  Rossi, Guéorguiev, B., Georgiev, G., and Stoianova, D., ?Laboulbeniales (Ascomycota) from Bulgaria and other countries?, Plant Biosystems, vol. 153, pp. 48-59, 2018.

M.  Langourov, Lazarov, S., Stoev, P., Guéorguiev, B., Deltshev, C., Petrov, B., Andreev, S., Simov, N., Bekchiev, R., Antonova, V., Ljubomirov, T., Dedov, I., and Georgiev, D., ?New and interesting records of the MSS and cave fauna of Vitosha Mt., Bulgaria?, Balkan Speleological Conference ?Sofia?2014?, Sofia, Bulgaria, 28 ? 30 March 2014. Caving Club ?Helictite? ? Sofia, pp. 66-76, 2014.

R.  Bekchiev and Guéorguiev, B., ?First purposive study of beetles (Coleoptera) from endogean environments in Bulgaria: collection sites and preliminary results?, Biodiversity Journal, vol. 6, no. 1, pp. 327?340, 2015.

P. M.  Giachino, Guéorguiev, B., and Vailati, D., ?A new remarkable subterranean beetle of the Rhodopes: Paralovricia n. gen. beroni n. sp. belonging to Lovriciina new subtribe (Coleoptera: Carabidae: Trechinae: Bembidiini)?, ZooKeys, vol. 117, pp. 59-72, 2011.

B.  Guéorguiev and Ljubomirov, T., ?Coleoptera and Hymenoptera (Insecta) from Bulgarian section of Maleshevska Planina Mountain: study of an until recently unknown biodiversity?, Acta Zoologica Bulgarica, vol. 61, no. 3, pp. 235-276, 2009.