Steen, Lynn Arthur, 1941- Counterexamples in topology / Lynn Arthur Steen, J. Arthur Seebach, Jr. - 2nd ed. - New York : Springer-Verlag, 1978. - xi, 244 p. : ill. ; 24 cm. Includes index. Bibliogr.: p. 228-235. ISBN: 0387903127 Subjects--Topical Terms: Topological spaces