@article{NUMA_1993__65_4_133732,
     author = {J.D. Ward and N. Sivakumar},
     title = {On the least squares fit by radial functions to multidimensional scattered data.},
     journal = {Numerische Mathematik},
     pages = {219--244},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {1993},
     zbl = {0797.41003},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__65_4_133732/}
}