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\bibitem{Caratelli_etal2013} {\textquotedblleft}\textit{The Dirichlet problem for the Laplace equation in supershaped annuli}{\textquotedblright}. Caratelli D, Gielis J, Tavkhelidze I, Ricci PE, Boundary value problems , 113 (2013).   http://doi.org/10.1186/1687-2770-2013-113

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