Geodesic
Interpolation by $L$-spline functions of many variables
Matematičeskie zametki, Tome 14 (1973) no. 1, pp. 11-20.

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The choice of function space allows us to make conclusions in the multidimensional case that are analogous to results in the theory of spline functions of one variable. We establish the minimum norm property, the existence and uniqueness of a solution of the interpolation problem, the property of best approximation, and the convergence of interpolation processes. 
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     author = {Yu. S. Zav'yalov},
     title = {Interpolation by $L$-spline functions of many variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {11--20},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_1_a1/}
}
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Yu. S. Zav'yalov. Interpolation by $L$-spline functions of many variables. Matematičeskie zametki, Tome 14 (1973) no. 1, pp. 11-20. http://geodesic.mathdoc.fr/item/MZM_1973_14_1_a1/