L.  Zerche, ?Myrmecobionte Aleocharinae bei Formica exsecta Nylander aus Bulgarien (Coleoptera, Staphylinidae)?, Entomologische Nachrichten und Berichte, vol. 32 , pp. 271-272, 1988.

L.  Zerche, ?Eine neue Art der Gattung Omalium Gravenhorst, 1802 aus Bulgarien (Coleoptera, Staphylinidae)?, Entomologische Blätter für Biologie und Systematik der Käfer, vol. 84, pp. 34-37, 1988.

L.  Zerche, ?Zur Taxonomie der Gattung Geostiba Thomson, 1858 (Coleoptera, Staphylinidae, Aleocharinae)?, Beiträge zur Entomologie, vol. 38, pp. 155-168, 1988.

I. M.  Raichev, ?Phenology and activity of the Staphylinidae (Coleoptera: Staphylinidae) from the central part of the Danube Plain?, Izvestiia na Muzeite v Severozapadna Bulgariia, vol. 14 , pp. 187-202, 1988.

I. B.  Vasilev, Sabeva, S., and Raichev, I. M., ?Study on the fauna of some subfamilies from the family Staphylinidae (Coleoptera) from the valley of the Blagoevgradska Bistrica River., pp. 91-98. In: Fauna of southwestern Bulgaria. Part 2?, Bulgarian Academy of Sciences, Sofia, 1988.