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Following problem
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"A local symmetry result for linear elliptic problems with solutions changing sign" (2011) Canuto, B. Annales de l'Institut Henri Poincare (C) Analyse Non Lineaire. 28(4):551-564
"Additive edge labelings" (2010) Dickenstein, A.; Tobis, E.A. Discrete Applied Mathematics. 158(5):444-452