HARTMANN, Nicolai. Letter to V. Seseman. Problemos, [S. l.], v. 48, p. 103–111, 1995. DOI: 10.15388/Problemos.1995.48.7029. Disponível em: https://test.zurnalai.vu.lt/problemos/article/view/7029. Acesso em: 27 oct. 2025.