The main research topics of the discipline are the emergence and spread of Glagolitic and Cyrillic.
In this connection the questions about their authorship (the life and work of Cyril and Methodius and the so-called five Apostles of the First Bulgarian Empire among their students and all of them canonized as Seven Saints), the exact time and place of creation, the schedule, the authenticity of the artistic sources, the nature of the liturgy during their missions.
[clarification needed] The historical sources of Cyril and Methodius are mainly Old Bulgarian and Latin.
In the following period, Croatian Glagolitic, Serbian Cyrillic and Ancient Russian Cyrillic - specific script and literacy were formed respectively, other than Old Bulgarian.
[3] In the period 1985-2003 Petar Dinekov published four volumes of the Cyrillo-Methodian Encyclopedia.