Geodesic
Polygonal approximation of functions of two variables
Sbornik. Mathematics, Tome 35 (1979) no. 6, pp. 851-861 Cet article a éte moissonné depuis la source Math-Net.Ru

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This paper studies the approximation of functions of two variables by functions whose graphs in $3$-space are continuous surfaces which are piecewise flat. By analogy with the case of functions of one variable, we naturally call such approximating functions polygonal. Bibliography: 8 titles. 
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     author = {K. I. Oskolkov},
     title = {Polygonal approximation of functions of two variables},
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K. I. Oskolkov. Polygonal approximation of functions of two variables. Sbornik. Mathematics, Tome 35 (1979) no. 6, pp. 851-861. http://geodesic.mathdoc.fr/item/SM_1979_35_6_a4/

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