Kokoszko, Maciej, and Mirosław J. Leszka. 2012. “Naval Fire/Liquid Fire. Byzantine „Miracle” Weapon and the Question of Its Familiarity to the Bulgarians Between the 7th and 11th Century”. Fasciculi Archaeologiae Historicae 25 (January):9-15. https://journals.iaepan.pl/fah/article/view/1448.