@article{GDZPPN001181467, title = {On Orthogonal Linear ...1 Approximation.}, journal = {Numerische Mathematik}, volume = {55}, year = {1987}, pages = {531-544}, zbl = {0633.65010}, url = {http://dml.mathdoc.fr/item/GDZPPN001181467} }
Späth, H.; Watson, G.A. On Orthogonal Linear ...1 Approximation.. Numerische Mathematik, Tome 55 (1987) pp. 531-544. http://gdmltest.u-ga.fr/item/GDZPPN001181467/