Geodesic
The limiting spectrum of a~non-self-conjugate second-order differential operator with slowly varying coefficients
Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 135-146.

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We describe the limiting spectrum $C(L)$ of the non-self-conjugate second-order differential operator $L$ with slowly varying coefficients, defined in $L^2(-\infty,\infty)$. The limiting spectrum is constructed from the spectra of operators with constant coefficients which are obtained from $L$ by “freezingrd”; the argument in the variable coefficients. 
@article{MZM_1973_13_1_a16,
     author = {L. B. Zelenko},
     title = {The limiting spectrum of a~non-self-conjugate second-order differential operator with slowly varying coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {135--146},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a16/}
}
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L. B. Zelenko. The limiting spectrum of a~non-self-conjugate second-order differential operator with slowly varying coefficients. Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 135-146. http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a16/