@article{10_4064_ap82_1_1,
     author = {Konstancja Bobecka and Jacek Weso{\l}owski},
     title = {Multiplicative {Cauchy} functional equation
 in the cone of positive-definite symmetric matrices},
     journal = {Annales Polonici Mathematici},
     pages = {1--7},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {2003},
     doi = {10.4064/ap82-1-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap82-1-1/}
}