Geodesic
Extremal interpolation in the mean with overlapping averaging intervals and $L$-splines
Izvestiya. Mathematics, Tome 62 (1998) no. 4, pp. 833-856 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper deals with the problem of extremal interpolation in the mean for large averaging intervals with the minimal value of the norm of a linear differential operator with constant real coefficients in the case when the extremal functions are $L$-splines. 
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     title = {Extremal interpolation in the mean with overlapping averaging intervals and $L$-splines},
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V. T. Shevaldin. Extremal interpolation in the mean with overlapping averaging intervals and $L$-splines. Izvestiya. Mathematics, Tome 62 (1998) no. 4, pp. 833-856. http://geodesic.mathdoc.fr/item/IM2_1998_62_4_a7/

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