Geodesic
On functions periodic in the mean
Izvestiya. Mathematics , Tome 4 (1970) no. 6, pp. 1406-1428.

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A study is made of systems of exponential functions that retain some of the properties of a trigonometric system. 
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A. M. Sedletskii. On functions periodic in the mean. Izvestiya. Mathematics , Tome 4 (1970) no. 6, pp. 1406-1428. http://geodesic.mathdoc.fr/item/IM2_1970_4_6_a7/

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