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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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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/

[1] V. A. Ilin, “O ravnomernoi ravnoskhodimosti razlozhenii po sobstvennym i prisoedinennym funktsiyam nesamosopryazhennogo obyknovennogo differentsialnogo operatora i v trigonometricheskii ryad Fure”, DAN SSSR, 223:3 (1975), 548–551 | MR

[2] E. I. Moiseev, “Formula srednego znacheniya dlya regulyarnogo resheniya obyknovennogo differentsialnogo uravneniya”, DAN SSSR, 223:3 (1975), 562–564 | MR

[3] V. A. Ilin, “Problema lokalizatsii i skhodimosti dlya ryadov Fure po fundamentalnym sistemam funktsii operatora Laplasa”, Uspekhi matem. nauk, XXIII:2(140) (1968), 61–120 | MR

[4] V. A. Ilin, Sh. A. Alimov, “Usloviya skhodimosti spektralnykh razlozhenii, otvechayuschikh samosopryazhennym rasshireniyam ellipticheskikh operatorov. I: Samosopryazhennoe rasshirenie operatora Laplasa s tochechnym spektrom”, Dif. uravneniya, 7:4 (1971), 670–710 | MR

[5] V. A. Ilin, “Neuluchshaemye lokalnye otsenki srednikh Rissa proizvolnoi funktsii iz klassa $L_2(G)$ dlya samosopryazhennogo rasshireniya operatora Laplasa”, Dif. uravneniya, 7:6 (1971), 1036–1041 | MR

[6] G. N. Vatson, Teoriya besselevykh funktsii, t. 1, IL, Moskva, 1949