https://9lib.org/document/zwvom0wg-weconsiderinthispaperthefollowingnonlinearanisotropicellipticfourierboundaryvalueproblem-introduction-andstanislasouaro-idrissaibrango-entropysolutionfordoublynonlinearellipticanisotropicproblemswithfourierboundaryconditions-dmdico-discussionesmathematica.html