On the spectrum of singularly perturbed operators
Journées équations aux dérivées partielles (1989), article no. 14, 10 p. 
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     title = {On the spectrum of singularly perturbed operators},
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     pages = {1--10},
     publisher = {Ecole polytechnique},
     year = {1989},
     zbl = {0675.47010},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1989____A14_0/}
}
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Olejnik, O. A. On the spectrum of singularly perturbed operators. Journées équations aux dérivées partielles (1989), article  no. 14, 10 p. http://archive.numdam.org/item/JEDP_1989____A14_0/

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