Geodesic
Nonlinear spline approximation of functions of several variables and $B$-spaces
Algebra i analiz, Tome 4 (1992) no. 4, pp. 45-79.

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     author = {Yu. A. Brudnyi and I. P. Irodova},
     title = {Nonlinear spline approximation of functions of several variables and $B$-spaces},
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     url = {http://geodesic.mathdoc.fr/item/AA_1992_4_4_a1/}
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Yu. A. Brudnyi; I. P. Irodova. Nonlinear spline approximation of functions of several variables and $B$-spaces. Algebra i analiz, Tome 4 (1992) no. 4, pp. 45-79. http://geodesic.mathdoc.fr/item/AA_1992_4_4_a1/