Nachbin L. Compact unions of closed subsets are closed and compact intersections of open subsets are open / L.Nachbin, 1991. - 7 p. - Текст : непосредственный.
Nachbin L. Convex cones and convex sets / L.Nachbin, 1992. - 23 p. - Текст : непосредственный.
Nachbin L. On the convexity of sets / L.Nachbin, 1992. - 6 p. - Текст : непосредственный.