Internal Comparisons—The Time Factor. Acta Oncologica, [S. l.], v. 30, n. Supp 1, p. 41–43, 1991. DOI: 10.3109/02841869109090082. Disponível em: https://medicaljournalssweden.se/actaoncologica/article/view/32642. Acesso em: 21 feb. 2025.