@article{CRMATH_2014__352_5_435_0,
     author = {Lee, Eun-Young and Bourin, Jean-Christophe},
     title = {Sums of unitarily equivalent positive operators},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {435--439},
     publisher = {Elsevier},
     volume = {352},
     number = {5},
     year = {2014},
     doi = {10.1016/j.crma.2014.03.012},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2014.03.012/}
}