JOURNAL , Lithuanian Mathematical. Information of the Ninth Republican Conference of the Mathematicians of Lithuanian SSR / Information of the Third Baltic Conference on geometry / Chronicle /Abstracts. Lithuanian Mathematical Journal, [S. l.], v. 9, n. 2, p. 373–439, 1969. Disponível em: https://journals.vu.lt./LMJ/article/view/20761. Acesso em: 26 apr. 2025.