TY  - JOUR
AU  - M. A. Krasnosel'skii
AU  - E. I. Pustyl'nik
TI  - The use of fractional powers of operators in studying Fourier series of eigenfunctions of differential operators
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 978
EP  - 981
VL  - 122
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_122_6_a5/
LA  - ru
ID  - DAN_1958_122_6_a5
ER  -