Geodesic
On the Riesz means of expansion in eigenfunctions and associated functions of a~nonselfadjoint ordinary differntial operator
Sbornik. Mathematics, Tome 31 (1977) no. 1, pp. 29-48

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For any function $f(x)\in L_1$, the connection between the Riesz means of expansions of $f(x)$ in a trigonometric series and in a biorthogonal series in the eigenfunctions and associated functions of a nonselfadjoint differential operator of order $2n$ is studied. Bibliography: 6 titles. 
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     title = {On the {Riesz} means of expansion in eigenfunctions and associated functions of a~nonselfadjoint ordinary differntial operator},
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V. V. Tikhomirov. On the Riesz means of expansion in eigenfunctions and associated functions of a~nonselfadjoint ordinary differntial operator. Sbornik. Mathematics, Tome 31 (1977) no. 1, pp. 29-48. http://geodesic.mathdoc.fr/item/SM_1977_31_1_a2/