Geodesic
Spectral analysis of higher-order differential operators with discontinuity conditions at an interior point
Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 63 (2017) no. 2, pp. 362-372

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Higher-order differential operators on a finite interval with jump conditions inside the interval are studied. Properties of spectral characteristics are obtained, and completeness and expansion theorems are proved for this class of operators. 
@article{CMFD_2017_63_2_a7,
     author = {V. A. Yurko},
     title = {Spectral analysis of higher-order differential operators with discontinuity conditions at an interior point},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {362--372},
     publisher = {mathdoc},
     volume = {63},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2017_63_2_a7/}
}
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V. A. Yurko. Spectral analysis of higher-order differential operators with discontinuity conditions at an interior point. Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 63 (2017) no. 2, pp. 362-372. http://geodesic.mathdoc.fr/item/CMFD_2017_63_2_a7/