GAVRILOV, Alexander; SEIDENSTICKER, Bernd. Vorwort zur Geschichte des Doppelheftes. Hyperboreus, Bern, v. 10, n. 1-2, p. 5–9, 2005. DOI: 10.36950/hyperboreus.v10pref. Disponível em: https://bop.unibe.ch/Hyperboreus/article/view/13760. Acesso em: 21 jun. 2026.