Lowen, Robert (1997). 《Approach spaces: the missing link in the topology–uniformity–metric triad》. Oxford Mathematical Monographs (영어). Clarendon Press. ISBN0-19-850030-0. MR472024. Zbl0891.54001.
Kopperman, Ralph (1988년 2월). “All topologies come from generalized metrics”. 《The American Mathematical Monthly》 (영어) 95 (2): 89–97. doi:10.2307/2323060. ISSN0002-9890. JSTOR2323060.
jstor.org
Kopperman, Ralph (1988년 2월). “All topologies come from generalized metrics”. 《The American Mathematical Monthly》 (영어) 95 (2): 89–97. doi:10.2307/2323060. ISSN0002-9890. JSTOR2323060.
Kopperman, Ralph (1988년 2월). “All topologies come from generalized metrics”. 《The American Mathematical Monthly》 (영어) 95 (2): 89–97. doi:10.2307/2323060. ISSN0002-9890. JSTOR2323060.
zbmath.org
Lowen, Robert (1997). 《Approach spaces: the missing link in the topology–uniformity–metric triad》. Oxford Mathematical Monographs (영어). Clarendon Press. ISBN0-19-850030-0. MR472024. Zbl0891.54001.