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Biblio
. 1987. Zweite internationale Konferenz der Prabulgaristen. Palaeobulgarica / Старобългаристика 11. (Palaeobulgarica / Старобългаристика). 120–121.
. 1976. A cyrillic inscription of 931 in Preslav. Bulgarian Historical Review, ,, 71-75. (2). 71-75.
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