@article{STO_1977_1977_1_a1,
     author = {Alsina, Claudi and Trillas, Enric},
     title = {Sobre m\'etricas naturales.},
     journal = {Stochastica},
     pages = {15-22},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/STO_1977_1977_1_a1/}
}