@article{AM2_1989__38_1_137328,
     author = {C. Alsina and J.L. Garcia-Roig},
     title = {On continuous preservation of norms and areas.},
     journal = {Aequationes mathematicae},
     pages = {211--215},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1989},
     zbl = {0686.39011},
     url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137328/}
}