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

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