Geodesic
Subharmonicity of the powers of the modulus of the gradient of a harmonic function
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 4 
I. S. Belov. Subharmonicity of the powers of the modulus of the gradient of a harmonic function. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 4. http://geodesic.mathdoc.fr/item/RM_1976_31_4_a13/
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     title = {Subharmonicity of the powers of the modulus of the gradient of a~harmonic function},
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     year = {1976},
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     number = {4},
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     url = {http://geodesic.mathdoc.fr/item/RM_1976_31_4_a13/}
}
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[1] E. M. Stein, G. Weiss, “On the theory of harmonic functions of several variables”, Acta Math., 103 (1960), 25–62 | DOI | MR | Zbl

[2] R. R. Coifman, G. Weiss, “Invariant systems of conjugate harmonic functions associated with compact Lie groups”, Studia Math., 44 (1972), 301–308 | MR | Zbl

[3] E. M. Stein, Topics in harmonic analysis, Ann. of Math. Stud., 63, 1970 | Zbl