  This article describes some recently obtained results on the low-energy
properties of the "Kondo quartet" model of two spin-1/2 impurities interacting
with two channels (flavours) of conduction electrons. We shall particularly
emphasize the connections between conformal field-theory methods and
bosonisation approaches, which are first illustrated on the example of the
single-impurity, two-channel Kondo problem. This article is dedicated to the
memory of Claude Itzykson, and will appear in the Proceedings of the Conference
"Advanced Quantum Field Theory", held in La Londe Les Maures, Sept. 1996 (Nucl.
Phys. B, Proc. Supp.; V.Rittenberg, J.Fr\"{o}lich and A.Schwimmer eds.).
