Operator Algebra in Logarithmic Conformal Field Theory
  For some time now, conformal field theories in two dimensions have been studied as integrable systems. Much of the success of these studies is related to the existence of an operator algebra of the theory. In this paper, some of the extensions of this machinery to the logarithmic case are studied, and used. More precisely, from Mobius symmetry constraints, the generic three and four point functions of logarithmic quasiprimary fields are calculated in closed form for arbitrary Jordan rank. As an example, c=0 disordered systems with non-degenerate vacua are studied. With the aid of two, three and four point functions, the operator algebra is obtained and associativity of the algebra studied. 
Jasbir Nagi