Geodesic
Spectral properties of a differential operator with involution
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2022), pp. 67-71

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The article defines a class of regular differential operators of the first order, the main part of which contains the involution operator and non-constant coefficient functions. We sketch a scheme for proving the unconditional basis property of the eigen and associated functions of regular differential operators of this type under some additional conditions. Examples of operators for which root functions do not form a basis are constructed. 
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     author = {Ya. A. Granilshchikova and A. A. Shkalikov},
     title = {Spectral properties of a differential operator with involution},
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     pages = {67--71},
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Ya. A. Granilshchikova; A. A. Shkalikov. Spectral properties of a differential operator with involution. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2022), pp. 67-71. http://geodesic.mathdoc.fr/item/VMUMM_2022_4_a9/