Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1976__27_132456, author = {O. Widlund}, title = {On {Best} {Error} {Bounds} for {Approximation} by {Piecewise} {Polynomial} {Functions.}}, journal = {Numerische Mathematik}, pages = {327--338}, publisher = {mathdoc}, volume = {27}, year = {1976}, zbl = {0331.41010}, url = {http://geodesic.mathdoc.fr/item/NUMA_1976__27_132456/} }
O. Widlund. On Best Error Bounds for Approximation by Piecewise Polynomial Functions.. Numerische Mathematik, Tome 27 (1976), pp. 327-338. http://geodesic.mathdoc.fr/item/NUMA_1976__27_132456/