S.M. Kulbakin - Russian Slavic philologist, paleographer, professor at Kharkov and Belgrade universities, member of the Serbian Academy of Sciences. In 1911-1912, his fundamental work "The Old Church Slavonic Language" was published in Kharkov, in three issues: phonetics (issue 1), reconstruction of pre-Slavic forms and forms of the Old Church Slavonic language (issue 2), texts with a short dictionary (issue 3).