MG11 
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Thermodynamical properties of hairy black holes with cosmological constant

After having revisited some black hole solutions with a conformally coupled scalar field,also with self interaction and cosmological constant, we discuss the solutions with regard to their general thermodynamical properties and, in particular, to the sign of entropy. Morover, we discuss the invariance of the entropy and of the Hawking temperature with respect to a general conformal frame transformation.