Harmonic Ritz and Lehmann bounds.
Beattie, Christopher
ETNA. Electronic Transactions on Numerical Analysis [electronic only], Tome 7 (1998), p. 18-39 / Harvested from The Electronic Library of Mathematics
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Publié le : 1998-01-01
EUDML-ID : urn:eudml:doc:119868 
@article{01249450,
     title = {Harmonic Ritz and Lehmann bounds.},
     journal = {ETNA. Electronic Transactions on Numerical Analysis [electronic only]},
     volume = {7},
     year = {1998},
     pages = {18-39},
     zbl = {0918.65027},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01249450}
}

Beattie, Christopher. Harmonic Ritz and Lehmann bounds.. ETNA. Electronic Transactions on Numerical Analysis [electronic only], Tome 7 (1998) pp. 18-39. http://gdmltest.u-ga.fr/item/01249450/