S.A. BADAEV; B.S. KALMURZAYEV; D.K. KABYLZHANOVA; K.SH.ABESHEV. UNIVERSAL POSITIVE PREORDERS . Известия НАН РК. Серия физико-математическая, [S. l.], n. 6, p. 49–53, 2018. DOI: 10.32014/2018.2518-1726.17. Disponível em: http://189185.vm7pq.group/physics-mathematics/article/view/4340. Acesso em: 18 янв. 2025.