Mihai Dragnea, "The Saxon expeditions against the Wends and the foundation of Magdeburg during Otto I's reign", The Romanian Journal for Baltic and Nordic Studies, 11/2 (2019), pp. 7-34 Mihai Dragnea

https://www.academia.edu/40987141/Mihai_Dragnea_The_Saxon_expeditions_against_the_Wends_and_the_foundation_of_Magdeburg_during_Otto_Is_reign_The_Romanian_Journal_for_Baltic_and_Nordic_Studies_11_2_2019_pp_7_34