GLEIRSCHER, P.; PONTA-ZITTERER, B. Bird depictions on Carolingian marbles in guilloche ornaments in Carantania. Arheološki vestnik, Ljubljana, Slovenija, v. 69, 2018. Disponível em: https://ojs.zrc-sazu.si/av/article/view/7757. Acesso em: 19 may. 2024.