VOSYLIUS, R. Einige Fragen der Flächentheorie. Lithuanian Mathematical Journal, [S. l.], v. 2, n. 2, p. 101–106, 1962. DOI: 10.15388/LMJ.1962.19340. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/19340. Acesso em: 3 may. 2025.