Bălgarski ezik: spisanie na Instituta za Bălgarski Ezik "Profesor Ljubomir Andrejčin" pri Bălgarskata Akademija na Naukite = Bulgarian language : journal published by Institute for Bulgarian Language Professor Lyubomir Andreychin at the Bulgarian Academy of Sciences (Institut za Bălgarski Ezik "Profesor Ljubomir Andrejčin" pri BAN, 1951)