Geodesic
On the spectral analysis of a differential operator with an involution and general boundary conditions
Eurasian mathematical journal, Tome 11 (2020) no. 2, pp. 30-39.

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We study first-order differential operators with an involution and non-periodic boundary conditions. We exhibit their spectral properties such as the asymptotic estimates of their eigenvalues, eigenvectors and spectral projections. We also use these properties to estimate the groups generated by the differential operators we study. The results were obtained by using the method of similar operators. 
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A. G. Baskakov; I. A. Krishtal; N. B. Uskova. On the spectral analysis of a differential operator with an involution and general boundary conditions. Eurasian mathematical journal, Tome 11 (2020) no. 2, pp. 30-39. http://geodesic.mathdoc.fr/item/EMJ_2020_11_2_a3/

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