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@article{ELMA_1979__34_141228, author = {M.S. Klamkin}, title = {Triangle inequalities from the triangle inequality.}, journal = {Elemente der Mathematik}, pages = {49--55}, publisher = {mathdoc}, volume = {34}, year = {1979}, zbl = {0399.51012}, url = {http://geodesic.mathdoc.fr/item/ELMA_1979__34_141228/} }
M.S. Klamkin. Triangle inequalities from the triangle inequality.. Elemente der Mathematik, Tome 34 (1979), pp. 49-55. http://geodesic.mathdoc.fr/item/ELMA_1979__34_141228/