@article{GDZPPN00117276X, title = {Multiple Zeros and Applications to Optimal Linear Functionals.}, journal = {Numerische Mathematik}, volume = {25}, year = {1975}, pages = {251-262}, zbl = {0307.65031}, url = {http://dml.mathdoc.fr/item/GDZPPN00117276X} }
Loeb, H.L.; Barrar, R.B. Multiple Zeros and Applications to Optimal Linear Functionals.. Numerische Mathematik, Tome 25 (1975) pp. 251-262. http://gdmltest.u-ga.fr/item/GDZPPN00117276X/