Пётр (герцог Фриуля) (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Пётр (герцог Фриуля)" in Russian language version.

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wikipedia.org

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Petros 77 // Prosopography of the Byzantine Empire^[англ.]. Vol. I: 641—867 (CD-ROM) / Martindale J. R. (ed.). — London: Ashgate Publishing, 2001.