@unpublished{ Gallistl.Huber.Peterseim:2015, author = {D. Gallistl and P. Huber and D. Peterseim}, title = {On the stability of the {R}ayleigh-{R}itz method for eigenvalues}, inspreprintnum= {1527}, year = {2017}, annote = {journal,inspreprint,ag-peterseim}, pdf = {http://peterseim.ins.uni-bonn.de/research/pub/INS1527.pdf}, note = {Accepted for publication in Numerische Mathematik. Available as INS Preprint No. 1527} }