Geodesic
The spectrum and spectral singularities of differential operators with periodic complex-valued coefficients
Differencialʹnye uravneniâ, Tome 19 (1983) no. 8, pp. 1316-1324 
O. A. Veliev. The spectrum and spectral singularities of differential operators with periodic complex-valued coefficients. Differencialʹnye uravneniâ, Tome 19 (1983) no. 8, pp. 1316-1324. http://geodesic.mathdoc.fr/item/DE_1983_19_8_a3/
@article{DE_1983_19_8_a3,
     author = {O. A. Veliev},
     title = {The spectrum and spectral singularities of differential operators with periodic complex-valued coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1316--1324},
     year = {1983},
     volume = {19},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_8_a3/}
}
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