TUNAITIS, S. J. H. Abicht, a professor of the Vilnius University. Problemos, [S. l.], v. 8, p. 53–57, 1971. DOI: 10.15388/Problemos.1971.8.5833. Disponível em: https://www.journals.vu.lt/problemos/article/view/5833. Acesso em: 7 apr. 2025.