R.  Bekchiev and Kostova, R., ?The Subfamily Pselaphinae (Coleoptera: Staphylinidae) of South-western Bulgaria: Rila and Pirin Mountains?, Acta Zoologica Bulgarica, vol. 74, pp. 169-174, 2022.

R.  Bekchiev and Hlavá?, P., ?Endogean and Cavernicolous Coleoptera of the Balkans. XX. Notes on the genus Protamaurops J. Müller, 1944 (Coleoptera: Staphylinidae: Pselaphinae) with the description of a new species from Bulgaria?, Zootaxa, vol. 4779, pp. 367?378, 2020.

R.  Kostova, Bekchiev, R., and Beshkov, S., ?Coleoptera and Lepidoptera (Insecta) diversity in the central part of Sredna Gora Mountains (Bulgaria)?, Bulletin of the Entomological Society of MaltaBulletin of the Entomological Society of Malta, vol. 10, pp. 75-95, 2019.

M.  Langourov, Simov, N., Bekchiev, R., Chobanov, D., Antonova, V., and Dedov, I., ?Inventory of selected groups of invertebrates in sedge and reedbeds not associated with open waters in Bulgaria?, Acta Zoologica Bulgarica, vol. 70, pp. 487-500, 2018.

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.

R.  Bekchiev and Guéorguiev, B., ?First purposive study of beetles (Coleoptera) from endogean environments in Bulgaria: collection sites and preliminary results?, Biodiversity JournalBiodiversity Journal, vol. 6, pp. 327?340, 2015.

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?, in Balkan Speleological Conference ?Sofia?2014?,Sofia, Bulgaria, 28 ? 30 March 2014, Sofia, 2014, pp. 66-76.

R.  Bekchiev and Brachat, V., ?Revision of the genus Delenda Croissandeau, 1891 (Coleoptera: Staphylinidae: Pselaphinae)?, Zootaxa, vol. 3765, pp. 583?592, 2014.

R.  Bekchiev, ?Description of a new species of Trimium Aubé, 1833 (Staphylinidae: Pselaphinae) from Bulgaria and Greece?, Acta zoologica bulgarica, vol. 65 , p. 289?291, 2013.

R.  Bekchiev, ?Faunistic review and description of a new species of Pselaphinae (Coleoptera:Staphylinidae) from the Strandzha Mountains (Bulgaria and Turkey)?, Turkish Journal of Zoology, vol. 37, pp. 431-440, 2013.

R.  Bekchiev, ?A study of the Pselaphinae (Coleoptera, Staphylinidae) in the Rhodope Mountains (Bulgaria)?, in Biodiversity of Bulgaria 4. Biodiversity of Western Rhodopes (Bulgaria and Greece) II., P.  Beron, Ed. Sofia: Pensoft Publishers & National Museum of Natural History, Bulgarian Academy of Sciences, 2011, p. 267?278.

R.  Bekchiev, ?The subfamily Pselaphinae (Coleoptera: Staphylinidae) of southwestern Bulgaria II: Belasitsa Mts.?, Biologia (Bratislava), vol. 66, pp. 506-508, 2011.

R.  Bekchiev, ?The subfamily Pselaphinae (Coleoptera: Staphylinidae) of southwestern Bulgaria. I.?, Historia Naturalis Bulgarica, vol. 19, pp. 51-71, 2008.

R.  Bekchiev, ?Variability in the structure of the aedeagus of Dicentrius rousi Besuchet 1999 ( Coleoptera: Staphylinidae: Pselaphinae).?, Acta Zoologica Bulgarica, vol. Supplementum 2, pp. 25-28, 2008.

P.  Hlavá?, Bekchiev, R., R??i?ka, J., and Lackner, T., ?Contribution to the knowledge of myrmecophilous beetles (Coleoptera) of Bulgaria.?, Acta Societatis Zoologicae Bohemicae, vol. 71 , pp. 131-136, 2007.

R.  Bekchiev and Shishiniova, M., ?A contribution to the Pselaphinae fauna (Coleoptera: Staphylinidae) of the Vitosha Mountain?, Acta Zoologica Bulgarica, vol. 59, pp. 33-39, 2007.

C.  Besuchet and Bekchiev, R., ?Description d'un nouveau Batrisodes de la Bulgarie (Coleoptera: Staphylinidae: Pselaphinae).?, Historia Naturalis Bulgarica, vol. 18, pp. 75-80, 2007.

R.  Bekchiev, ?Faunistical research on Pselaphinae fauna (Coleoptera: Staphylinidae) in several regions of south-west Bulgaria?, Sofia University 'St. Climent Ohridski", Sofia, 2007.