Iván Asen IV (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Iván Asen IV" in Spanish language version.

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Andreev, 1993, pp. 23-52 Andreev, Yordan (1993). Bǎlgarija prez vtorata četvǎrt na XIV v. (en búlgaro). Veliko Tarnovo: Sv. Kliment Ohridski. OCLC 69163573.
Andreev, 1993, pp. 67-75 Andreev, Yordan (1993). Bǎlgarija prez vtorata četvǎrt na XIV v. (en búlgaro). Veliko Tarnovo: Sv. Kliment Ohridski. OCLC 69163573.