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@article{PORMA_1955__14_1_114747, author = {Weston, J.D.}, title = {Hypermetric groups}, journal = {Portugaliae mathematica}, pages = {21--25}, publisher = {mathdoc}, volume = {14}, number = {1}, year = {1955}, mrnumber = {0073924}, zbl = {0065.26401}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1955__14_1_114747/} }
Weston, J.D. Hypermetric groups. Portugaliae mathematica, Tome 14 (1955) no. 1, pp. 21-25. http://geodesic.mathdoc.fr/item/PORMA_1955__14_1_114747/