Trees, tight extensions of metric spaces, and the cohomological dimension of certain groups: a note on combinatorial properties of metric spaces. Dress, A. W. M. Adv. in Math., 53(3):321–402, 1984.
Trees, tight extensions of metric spaces, and the cohomological dimension of certain groups: a note on combinatorial properties of metric spaces [link]Paper  doi  bibtex   
@article{MR753872,
	Author = {Dress, Andreas W. M.},
	Coden = {ADMTA4},
	Date-Added = {2015-06-05 10:22:35 +0000},
	Date-Modified = {2015-06-05 10:22:35 +0000},
	Doi = {10.1016/0001-8708(84)90029-X},
	Fjournal = {Advances in Mathematics},
	Issn = {0001-8708},
	Journal = {Adv. in Math.},
	Mrclass = {05C10 (20F32 20J05 54C25 54F50)},
	Mrnumber = {753872 (86j:05053)},
	Mrreviewer = {Peter J. Slater},
	Number = {3},
	Pages = {321--402},
	Title = {Trees, tight extensions of metric spaces, and the cohomological dimension of certain groups: a note on combinatorial properties of metric spaces},
	Url = {http://dx.doi.org/10.1016/0001-8708(84)90029-X},
	Volume = {53},
	Year = {1984},
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