@article{ETNA_2009__33__a7,
     author = {Reichel, Lothar and Ye, Qiang},
     title = {Simple square smoothing regularization operators},
     journal = {Electronic transactions on numerical analysis},
     publisher = {mathdoc},
     volume = {33},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2009__33__a7/}
}