1. Compactness and the axiom of choice;Herrlich;Appl. Categ. Struct.,1996
2. H. Herrlich and J. Steprāns, Maximal filters, continuity, and choice principles, Quaestiones Math., to appear.
3. H. Herrlich and G.E. Strecker, When is N Lindelöf?, Comment. Math. Univ. Carolin. 38, to appear.
4. Eine Bemerkung zum Auswahlaxiom;Jech;Časopis Pěst. Mat.,1968
5. The Axiom of Choice;Jech,1973