NORKUS, Zenonas. New Books for Those Who are Learning. Problemos, [S. l.], v. 64, p. 182–187, 2003. DOI: 10.15388/Problemos.2003.64.5366. Disponível em: https://www.journals.vu.lt/problemos/article/view/5366. Acesso em: 5 dec. 2025.