FARROKH, Kaveh, Gholamreza KARAMIAN, and Hamid KARAMIAN. “Military Architecture and the Four-Spāhbed System for Defense of the Sasanian Empire (224-651 CE)”. Historia i Świat 10 (September 3, 2021): 117–151. Accessed March 26, 2026. https://czasopisma.uph.edu.pl/historiaswiat/article/view/2553.