@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/