Byzantium, Bulgaria and the Peoples of Ukraine in the 890s: a Critical Re-examination of the Logothete's Account - Howard-Johnston, J. D. (Vizantija i Krym. Meždunarodnaja konferencija, Sevastopol', 6-11 ijunja 1997 g. Colloque International "Byzance et la Crimée", Sébastopol, 6-11 juin 1997. Tezisy dokladov. Résumés., 1997)