\hrefanchor \outdef{citeAn61}{An61} \hbox{\parbox[t]{\rw}{[\cite{An61}]}\parbox[t]{\colw}{P.W. Anderson - {\it Localized magnetic states in metals}, Physical Review, Vol.~124, n.~1, p.~41-53, 1961.}}\par \bigskip \hrefanchor \outdef{citeAn80}{An80} \hbox{\parbox[t]{\rw}{[\cite{An80}]}\parbox[t]{\colw}{N. Andrei - {\it Diagonalization of the Kondo Hamiltonian}, Physical Review Letters, Vol.~45, n.~5, 1980.}}\par \bigskip \hrefanchor \outdef{citeBGJ15}{BGJ15} \hbox{\parbox[t]{\rw}{[\cite{BGJ15}]}\parbox[t]{\colw}{G. Benfatto, G. Gallavotti, I. Jauslin - {\it Kondo effect in a Fermionic hierarchical model}, arXiv 1506.04381, 2015.}}\par \bigskip \hrefanchor \outdef{citeKo64}{Ko64} \hbox{\parbox[t]{\rw}{[\cite{Ko64}]}\parbox[t]{\colw}{J. Kondo - {\it Resistance minimum in dilute magnetic alloys}, Progress of Theoretical Physics, Vol.~32, n.~1, 1964.}}\par \bigskip