7th century (English Wikipedia)

Ostrogorsky, George (1959). "The Byzantine Empire in the World of the Seventh Century". Dumbarton Oaks Papers. 13: 3. doi:10.2307/1291126. ISSN 0070-7546. JSTOR 1291126.
Roland 1992, p. 657; Pryor & Jeffreys 2006, p. 608 Roland, Alex (1992), "Secrecy, Technology, and War: Greek Fire and the Defense of Byzantium", Technology and Culture, 33 (4): 655–679, doi:10.2307/3106585, JSTOR 3106585, S2CID 113017993 Pryor, John H.; Jeffreys, Elizabeth M. (2006), The Age of the ΔΡΟΜΩΝ: The Byzantine Navy ca. 500–1204, Brill Academic Publishers, ISBN 978-9004151970

english-heritage.org.uk (Global: 4,061^st place; English: 2,530^th place)

Ostrogorsky, George (1959). "The Byzantine Empire in the World of the Seventh Century". Dumbarton Oaks Papers. 13: 3. doi:10.2307/1291126. ISSN 0070-7546. JSTOR 1291126.
Roland 1992, p. 657; Pryor & Jeffreys 2006, p. 608 Roland, Alex (1992), "Secrecy, Technology, and War: Greek Fire and the Defense of Byzantium", Technology and Culture, 33 (4): 655–679, doi:10.2307/3106585, JSTOR 3106585, S2CID 113017993 Pryor, John H.; Jeffreys, Elizabeth M. (2006), The Age of the ΔΡΟΜΩΝ: The Byzantine Navy ca. 500–1204, Brill Academic Publishers, ISBN 978-9004151970

Kamouch, Mohammed (2006). "Jewels of the Muslim Chinese Heritage". Muslim Heritage. Retrieved 4 December 2021.

Roland 1992, p. 657; Pryor & Jeffreys 2006, p. 608 Roland, Alex (1992), "Secrecy, Technology, and War: Greek Fire and the Defense of Byzantium", Technology and Culture, 33 (4): 655–679, doi:10.2307/3106585, JSTOR 3106585, S2CID 113017993 Pryor, John H.; Jeffreys, Elizabeth M. (2006), The Age of the ΔΡΟΜΩΝ: The Byzantine Navy ca. 500–1204, Brill Academic Publishers, ISBN 978-9004151970