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://www.journals.vu.lt/problemos/article/view/7029.. Acesso em: 1 may. 2024.