@article{GDZPPN002082152, title = {A pair of general triangle inequalities.}, journal = {Elemente der Mathematik}, volume = {44}, year = {1989}, pages = {41-47}, zbl = {0714.51012}, url = {http://dml.mathdoc.fr/item/GDZPPN002082152} }
Gmeiner, W. A pair of general triangle inequalities.. Elemente der Mathematik, Tome 44 (1989) pp. 41-47. http://gdmltest.u-ga.fr/item/GDZPPN002082152/