BANAKH, T. O.; Radyl Т. On universality of countable powers of absolute retracts. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 4, p. 540–542, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5317. Acesso em: 5 dec. 2025.