The article Psyllids (Hemiptera: Psylloidea) in the entomological collection of the National Museum of Natural History, Bulgarian Academy of Sciences, published in the Museum's prestigious refereed journal Historia naturalis bulgarica, described the entire collection of psyllids (Hemiptera: Psylloidea) stored in the National Museum of Natural History, Sofia (NMNHS), and digitized under the project "Upgrading the Scientific Infrastructure "Distributed System of Scientific Collections - Bulgaria (DiSSCo-BG)".

Part of the digitized material confirms the published data from the beginning of the 20th century by one of the founders of the Bulgarian entomological school - Dimitar Joakimov, although his main collection was lost during the bombing of Sofia in the Second World War. The other part of the collection is with material collected later, unexplored until now. During its study, the authors Monika Pramatarova (NMNHS), Igor Malenovský (Moravian Museum in Brno, Czech Republic) and Ilia Gjonov (Sofia University "St. Kliment Ohridski") found that the collection contains 25 species, three of which are new to the fauna of Bulgaria and are reported for the first time in the publication. The species are Aphalara maculipennis Löw, 1886, Cacopsylla ulmi (Foerster, 1848) and Dyspersa abdominalis (Flor, 1861).

The entomological collection of the National Museum of Natural History, Sofia is the largest in Bulgaria and stores over 500,000 specimens of various groups of insects, including the type specimens of many species new to science.

Museum scientists continue the digitization of the entomological collection of NMNHS and hope to publish the next results soon.