SZILVÁGYI, Gábor; VARGA, Gábor. Birch bark pitch identified in Roman Age Pannonia. Communicationes Archaeologicae Hungariae, [S. l.], v. 2007, p. 165–174, 2007. DOI: 10.54640/CAH.2007.165. Disponível em: https://ojs.elte.hu/comarchhung/article/view/3699. Acesso em: 13 feb. 2026.