The laplacian and the discrete laplacian
Compositio Mathematica, Tome 69 (1989) no. 1, pp. 111-120. 
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     author = {Ditzian, Z.},
     title = {The laplacian and the discrete laplacian},
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     number = {1},
     year = {1989},
     mrnumber = {986815},
     zbl = {0738.35015},
     language = {en},
     url = {http://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. http://www.numdam.org/item/CM_1989__69_1_111_0/

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

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