@book{60724,
	author = { Copson, E. T.},
	title = {Metric spaces /},
	publisher = {Cambridge University Press, },
	year = {1968},
	series = {Cambridge tracts in mathematics and mathematical physics, no. 57},
	address = {London :},
	url = {https://www.cambridge.org/core/books/metric-spaces/BA4E385AAC6E2F4206773B0818A318BC}
}