East Central Europe in the Middle Ages, 1000-1500, pp. 46 Crônica de Constantino Manasses, Transcrição vaticana, pp. 145, veja Batalha de Plisca Hanswilhelm Haefs, Das goldene Reich der Pamir-Bulgaren an Donau und Wardar (p. 120), ISBN 3-8334-2340-4
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