GUDAITYTĖ, R.; RADVILAVIČIUS, V. New Theses. Problemos, [S. l.], v. 18, p. 119–122, 1976. DOI: 10.15388/Problemos.1976.18.5651. Disponível em: https://www.journals.vu.lt/problemos/article/view/5651.. Acesso em: 1 may. 2024.