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@article{ELMA_1987__42_4_141415, author = {George A. Tsintsifas}, title = {A generalization of a two triangle inequality.}, journal = {Elemente der Mathematik}, pages = {150--153}, publisher = {mathdoc}, volume = {42}, number = {4}, year = {1987}, zbl = {0714.51013}, url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141415/} }
George A. Tsintsifas. A generalization of a two triangle inequality.. Elemente der Mathematik, Tome 42 (1987) no. 4, pp. 150-153. http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141415/