no. 1
The laplacian and the discrete laplacian
Compositio Mathematica, Tome 69 (1989) no. 1, pp. 111-120 
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     author = {Ditzian, Z.},
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     zbl = {0738.35015},
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     url = {https://www.numdam.org/item/CM_1989__69_1_111_0/}
}
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Ditzian, Z. The laplacian and the discrete laplacian. Compositio Mathematica, Tome 69 (1989) no. 1, pp. 111-120. https://www.numdam.org/item/CM_1989__69_1_111_0/

1 Z. Ditzian: Some remarks on approximation theorems on various Banach spaces, Jour. of Math. Analysis and Appl. 77 (1980) 567-576. | Zbl | MR

2 E. Stein: Singular Integrals and Differentiability Properties of Functions, Princeton Univ. Press (1970). | Zbl | MR

3 V.G. Timofeev: Landau inequality for functions of several variables, Mat. Zam. 37 (1985) 676-689. English translation Math. Notes (1985) 369-377. | Zbl | MR