Singular perturbations of spectra

Author(s):  
P. P. N. de Groen
2003 ◽  
Vol 6 (4) ◽  
pp. 349-384 ◽  
Author(s):  
Vladimir Derkach ◽  
Seppo Hassi ◽  
Henk de Snoo

1984 ◽  
Vol 17 (2) ◽  
pp. 1525-1530
Author(s):  
A. Bensoussan ◽  
G.L. Blankenship

2004 ◽  
Vol 5 (4) ◽  
pp. 773-808 ◽  
Author(s):  
Michele Correggi ◽  
Gianfausto Dell’Antonio

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