@article{CRMATH_2016__354_2_143_0,
     author = {Belton, Alexander and Guillot, Dominique and Khare, Apoorva and Putinar, Mihai},
     title = {Matrix positivity preservers in fixed dimension},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {143--148},
     publisher = {Elsevier},
     volume = {354},
     number = {2},
     year = {2016},
     doi = {10.1016/j.crma.2015.11.006},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2015.11.006/}
}