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@article{MM2_1981__34_154769, author = {W.M. Greenlee}, title = {Stability {Theorems} for {Singular} {Perturbation} of {Eigenvalues.}}, journal = {Manuscripta mathematica}, pages = {157--174}, publisher = {mathdoc}, volume = {34}, year = {1981}, zbl = {0489.47004}, url = {http://geodesic.mathdoc.fr/item/MM2_1981__34_154769/} }
W.M. Greenlee. Stability Theorems for Singular Perturbation of Eigenvalues.. Manuscripta mathematica, Tome 34 (1981), pp. 157-174. http://geodesic.mathdoc.fr/item/MM2_1981__34_154769/