SPRINDZUK, V. G. On one classification of transcendental numbers. Lithuanian Mathematical Journal, [S. l.], v. 2, n. 2, p. 215–219, 1962. DOI: 10.15388/LMJ.1962.19355. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/19355. Acesso em: 8 jun. 2025.