Komatina 2010, p. 4. Komatina, P. (2010). «The Slavs of the mid-Danube basin and the Bulgarian expansion in the first half of the 9th century». Belgrado: Serbian Academy of Sciences and Arts - SASA, Institute for Byzantine Studies. Zbornik radova Vizantološkog instituta. 47: 55–82. doi:10.2298/ZRVI1047055K
Komatina 2010, p. 19. Komatina, P. (2010). «The Slavs of the mid-Danube basin and the Bulgarian expansion in the first half of the 9th century». Belgrado: Serbian Academy of Sciences and Arts - SASA, Institute for Byzantine Studies. Zbornik radova Vizantološkog instituta. 47: 55–82. doi:10.2298/ZRVI1047055K
Komatina 2010, p. 24. Komatina, P. (2010). «The Slavs of the mid-Danube basin and the Bulgarian expansion in the first half of the 9th century». Belgrado: Serbian Academy of Sciences and Arts - SASA, Institute for Byzantine Studies. Zbornik radova Vizantološkog instituta. 47: 55–82. doi:10.2298/ZRVI1047055K
