HARTMANN, Frida. Letter to V. Seseman. Problemos, [S. l.], v. 53, p. 189–190, 1998. DOI: 10.15388/Problemos.1998.53.6916. Disponível em: https://www.journals.vu.lt/problemos/article/view/6916. Acesso em: 2 feb. 2026.