Kostova, R., Borissov, S., Bobeva A., Bekchiev, R., 2024. At a crossroads: Genetic lineages and dispersal routes of Morimus asper (Sulzer, 1776) s.l. (Coleoptera, Cerambycidae) in Bulgaria. — Biodiversity Data Journal, 12: e116619. doi:10.3897/BDJ.12.e116619
Kostova, R., Bekchiev, R., Popgeorgiev, G., Kornilev, Y. V., 2023. First exhaustive distribution and habitat modelling of Morimus asper (Sulzer, 1776) sensu lato (Coleoptera, Cerambycidae) in Bulgaria. — Nature Conservation, 53: 39—59. doi:10.3897/natureconservation.53.104243
Kostova, R., Bekchiev, R., 2023. Ground beetle (Coleoptera: Carabidae) taxocoenoses from high altitude Pinus peuce and Pinus heldreichii forests in Bulgaria. — Historia naturalis bulgarica, 45 (7): 187—196. [PDF] doi:10.48027/hnb.45.073
Kostova, R., Bekchiev, R., 2023. Data on the distribution of Osmoderma barnabita Motschulsky, 1845 (Coleoptera: Cetoniidae) in Bulgaria from 1904 to 2022. — Historia naturalis bulgarica, 45 (6): 155—161. [PDF] doi:10.48027/hnb.45.061
Kostova, R., Bekchiev, R., 2023. Trechus (s. str.) “subnotatus” species group (Coleoptera: Carabidae) in Bulgaria. — Zootaxa, 5264 (4): 505—525. doi:10.11646/zootaxa.5264.4.3
Bekchiev, R., Kostova, R., 2023. New data about the distribution of Plectophloeus fischeri (Aubé, 1833) and Dicentrius biroi Besuchet, 1999 (Coleoptera: Staphylinidae: Pselaphinae) in Bulgaria. — Historia naturalis bulgarica, 45 (2): 39—42. [PDF] doi:10.48027/hnb.45.024
Bekchiev, R., Kostova, R., 2022. The Subfamily Pselaphinae (Coleoptera: Staphylinidae) of South-western Bulgaria: Rila and Pirin Mountains. — Acta zoologica bulgarica, 74 (2): 169—174.
Bekchiev, R., Antov, M., Boyadzhiev, P., Zaemdzhikova, G., Kostova, R., Guéorguiev, B., 2022. Carabus variolosus (Fabricius, 1787) (Coleoptera: Carabidae) in Bulgaria: rediscovered after 111 years. — Historia naturalis bulgarica, 44 (10): 119—123. [PDF] doi:10.48027/hnb.44.103
Zidarova, S., Kostova, R., 2021. A Pilot Monitoring Survey of the Lesser Blind Mole-rat Nannospalax (superspecies leucodon) (Mammalia: Rodentia) in Bulgaria. — Acta zoologica bulgarica, 73 (1): 107—112.
Bekchiev, R., Crevecoeur, L., Gielen, K., Bosmans, B., Smets, K., Kostova, R., 2020. One Hundred Years of Solitude: Rediscovery of the Rare and Protected Beetle Rhysodes sulcatus (Fabricius, 1787) (Coleoptera: Rhysodidae) in Bulgaria. — Acta zoologica bulgarica, (in print) published online at http://www.acta-zoologica-bulgarica.eu/002372.