A Rational Logarithmic Conformal Field Theory
  We analyse the fusion of representations of the triplet algebra, the maximally extended symmetry algebra of the Virasoro algebra at c=-2. It is shown that there exists a finite number of representations which are closed under fusion. These include all irreducible representations, but also some reducible representations which appear as indecomposable components in fusion products. 
Matthias R. Gaberdiel, Horst G. Kausch