Byzantine–Sasanian War of 602–628 (English Wikipedia)

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Dennis 1998, p. 104 Dennis, George T. (1998), "Byzantine Heavy Artillery: the Helepolis" (PDF), Greek, Roman and Byzantine Studies, vol. 39, Duke University, pp. 99–115, archived from the original (PDF) on 2011-08-05
Dennis 1998, pp. 99–104 Dennis, George T. (1998), "Byzantine Heavy Artillery: the Helepolis" (PDF), Greek, Roman and Byzantine Studies, vol. 39, Duke University, pp. 99–115, archived from the original (PDF) on 2011-08-05

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Iwona, Maksymiuk Katarzyna (2017). "Destruction of the ādur gušnasp temple in ādurbādagān as a revenge for abduction of the Holy Cross from Jerusalem in the context of the letters of Heraclius". Метаморфозы истории (9): 109–125. ISSN 2308-6181. Genuineness of the letter had been convincingly denied by R. W. Thomson