1. Reflectors as composition of epireflectors;Baron;Trans. Am. Math. Soc.,1969
2. Topological Spaces;Čech,1966
3. Injective envelopes of Banach spaces;Cohen;Bull. Am. Math. Soc.,1964
4. A survey of cardinal invariants;Comfort;Gen. Topology Appl.,1971
5. On the basis problem in normed spaces;Day;Proc. Am. Math. Soc.,1962