@article{AM2_1997__54_3_137705,
     author = {C. Alsina and M.S. Tom\'as and P. Guijarro},
     title = {Some remarkable lines of triangles in real normed spaces and characterizations of inner product structures.},
     journal = {Aequationes mathematicae},
     pages = {234--241},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1997},
     zbl = {0906.39012},
     url = {http://geodesic.mathdoc.fr/item/AM2_1997__54_3_137705/}
}