@article{GDZPPN001166905, title = {Optimal Approximation and Error Bounds in Seminormed Spaces.}, journal = {Numerische Mathematik}, volume = {10}, year = {1967}, pages = {370-388}, zbl = {0261.65009}, url = {http://dml.mathdoc.fr/item/GDZPPN001166905} }
MEINGUET, J. Optimal Approximation and Error Bounds in Seminormed Spaces.. Numerische Mathematik, Tome 10 (1967) pp. 370-388. http://gdmltest.u-ga.fr/item/GDZPPN001166905/