Geodesic
Eigenfunction expansion of a certain differential operator in a space of vector-valued functions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1 
V. A. Bezverkhnii. Eigenfunction expansion of a certain differential operator in a space of vector-valued functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1. http://geodesic.mathdoc.fr/item/RM_1975_30_1_a9/
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[1] H. Langer, “Über die Method der richtenden Functionale von M. G. Krein”, Acta Math. Acad. Sci. Hungar, 21:1–2 (1970), 207–224 | DOI | MR | Zbl

[2] V. I. Gorbachuk, M. L. Gorbachuk, “Razlozhenie po sobstvennym funktsiyam, differentsialnogo uravneniya vtorogo poryadka s operatornymi koeffitsientami”, DAN, 184:4 (1969), 774–777 | Zbl