@article{NUMA_1973__21_132223, author = {Daniel Wulbert}, title = {A {Note} on {Polynomial} {Splines} with {Free} {Knots.}}, journal = {Numerische Mathematik}, pages = {181--184}, publisher = {mathdoc}, volume = {21}, year = {1973}, zbl = {0265.65006}, url = {http://geodesic.mathdoc.fr/item/NUMA_1973__21_132223/} }