A symmetry result for an overdetermined elliptic problem using continuous rearrangement and domain derivative

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Remarks on an overdetermined boundary value problem (2008, methodology): “A totally different line of reasoning was pursued in [2], where Brock and Henrot used continuous Steiner symmetrization and domain derivative to study an overdetermined problem under the assumption that is a convex domain and for a class of quasilinear operators of p-Laplacian-type.”
Overdetermined problems with fractional Laplacian (2013, background): “Since a complete list of references cannot be given, we only quote: [1, 4, 7, 8, 11, 10, 12, 19, 20, 22, 23, 25, 28, 31, 32, 34, 33, 39, 38].”
Overdetermined problems with possibly degenerate ellipticity, a geometric approach (2006, methodology): “1 The assumptions made on the operator A in [15] (and in [6]) were that A(t) = f ′(t)/t, where f is a positive convex function of class C2(0, +∞) satisfying c1(t − 1) ≤ tf ′(t) ≤ c2(t + 1) , c1 ≤ tf ′′(t)/f ′(t) ≤ c2 for all t > 0, some r ∈ (1, +∞) and some positive constants c1 and c2.”