Tadeusz Baranowski and Leszek Gajewski (1997)
The Angel and the Dragon: two medallions from an early medieval hill-fort in Kalisz, Poland.
In: Art and Symbolism in Medieval Europe: Papers of the "Medieval Europe Brugge 1997" Conference, 5 , ed. by Guy DE BOE and Frans VERHAEGHE. Instituut voor het Archeologisch Patrimonium, Wetenschappelijke instelling van de Vlaamse Gemeenschap, Zellik, pp. 119-125.
The article discusses 2 medallions depicting a winged figure, possibly an archangel, and a winged dragon.