@article{PS_2014__18__251_0,
     author = {Lescornel, H\'el\`ene and Loubes, Jean-Michel and Chabriac, Claudie},
     title = {Unbiased risk estimation method for covariance estimation},
     journal = {ESAIM: Probability and Statistics},
     pages = {251--264},
     publisher = {EDP-Sciences},
     volume = {18},
     year = {2014},
     doi = {10.1051/ps/2013034},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ps/2013034/}
}