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ARNOLD, Udo. Ordines Militares ‒ 20 Konferenzen. Der Weg einer Freundschaft / Ordines Militares – 20 Conferences. The Way of a Friendship. Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders. Online. 29 December 2020. Vol. 25, pp. 387-420. [Accessed 19 June 2024]. DOI 10.12775/OM.2020.015.