Geodesic
The use of fractional powers of operators in studying Fourier series of eigenfunctions of differential operators
Doklady Akademii Nauk, Tome 122 (1958) no. 6, pp. 978-981.

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     author = {M. A. Krasnosel'skii and E. I. Pustyl'nik},
     title = {The use of fractional powers of operators in studying {Fourier} series of eigenfunctions of differential operators},
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     pages = {978--981},
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M. A. Krasnosel'skii; E. I. Pustyl'nik. The use of fractional powers of operators in studying Fourier series of eigenfunctions of differential operators. Doklady Akademii Nauk, Tome 122 (1958) no. 6, pp. 978-981. http://geodesic.mathdoc.fr/item/DAN_1958_122_6_a5/