@article{GDZPPN001170937, title = {Singular Splines.}, journal = {Numerische Mathematik}, volume = {19}, year = {1972}, pages = {342-349}, zbl = {0241.65014}, url = {http://dml.mathdoc.fr/item/GDZPPN001170937} }
Chan, Paula P. Singular Splines.. Numerische Mathematik, Tome 19 (1972) pp. 342-349. http://gdmltest.u-ga.fr/item/GDZPPN001170937/