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 = {https://proceedings.centre-mersenne.org/item/JEDP_1989____A14_0/}
}
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O. A. Olejnik. On the spectrum of singularly perturbed operators. Journées équations aux dérivées partielles (1989), article  no. 14, 10 p. https://proceedings.centre-mersenne.org/item/JEDP_1989____A14_0/

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[7] O.A. Oleinik : On spectrums of some singularly perturbed operators ; Uspekhi Mat. Nauk, 42, n° 3, 1987, p. 221-222.

[8] Yu. D. Golovaty - S.A. Nazarov - O.A. Oleinik - T.S. Soboleva : On eigen vibrations of a string with concentrated masses ; Sibirsky Mat. Jour., v. 29, n° 5, 1988, p71-91. | Zbl

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