KALENDA, Česlovas. On the Ways "Problemos" Has Gone and Its Goals. Problemos, [S. l.], v. 61, p. 179–180, 2002. DOI: 10.15388/Problemos.2002.61.6750. Disponível em: https://journals.vu.lt./problemos/article/view/6750. Acesso em: 27 apr. 2025.