Geodesic
The problem of convergence in point trigonometric interpolation process of Lagrange
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 9-14

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An analogue of the characteristic of R. Salem is obtained for a trigonometric Lagrange interpolation process on the matrix of equally spaced nodes. 
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L. V. Borisova; A. V. Shatalina. The problem of convergence in point trigonometric interpolation process of Lagrange. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 10 (2010) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/ISU_2010_10_1_a1/