1. R.L. Blair, Mappings that preserve realcompactness (8 pp.), Unpublished manuscript available at http://at.yorku.ca/t/o/p/d/43.pdf.
2. Covering properties;Burke,1984
3. On the Hewitt realcompactification of a product space;Comfort;Trans. Am. Math. Soc.,1968
4. General Topology;Engelking,1989
5. Rings of Continuous Functions;Gillman,1976