Bulgarian, French, German, or Russian; mostly in English, <2008->; entirely in English, <2017->
Summaries in Bulgarian, English, and/or Russian.
Issued by: Bŭlgarska akademii͡a na naukite, 1975- ; by: Institute of Zoology, Bulgarian Academy of Sciences, <Dec. 2002-Dec. 2008>; by: Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, <Dec. 2017->