@article{10_4153_CMB_2003_053_x,
     author = {Marco, Nicolas and Massaneda, Xavier},
     title = {On {Density} {Conditions} for {Interpolation} in the {Ball}},
     journal = {Canadian mathematical bulletin},
     pages = {559--574},
     year = {2003},
     volume = {46},
     number = {4},
     doi = {10.4153/CMB-2003-053-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-053-x/}
}