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2. D. Bushaw, Elements of general topology. New York 1963.
3. P. Fletchee, Pairwise uniform spaces. Doctoral dissertation, University of North Carolina at Chapel Hill, Chapel Hill, N. C., 1966.
4. P.Fletcher, On completeness of quasi-uniform spaces. Submitted for publication.
5. P. Fletcher, H. B. Hoyle andC. W. Patty, The comparison of topologies. Duke Math. J.36, 325?331 (1969).