ZHUMABEKOVA, G.E.; ULBRIKHT, O.I. Normality and superperfection of Jonsson spectra. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 123, n. 3, p. 200–209, 2026. DOI: 10.31489/2026m3/200-209. Disponível em: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/1365. Acesso em: 30 sep. 2026.