POZNAŃSKI, Adam. Working on medieval manuscripts in the 19th century. Letter from Hermann Usener to Friedrich Haase. Analecta. Studia i Materiały z Dziejów Nauki, [S. l.], v. 32, n. 1, p. 125–136, 2026. Disponível em: https://wydawnictwo.pan.pl/index.php/a/article/view/7167. Acesso em: 19 paź. 2026.