@article{ARM_1999__35_1_a2,
     author = {Alsina, C. and Cruells, P. and Tom\'as, M. S.},
     title = {Characterizations of inner product spaces through an isosceles trapezoid property},
     journal = {Archivum mathematicum},
     pages = {21--27},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1999},
     mrnumber = {1684520},
     zbl = {1050.46507},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1999__35_1_a2/}
}