Construction of some Quantum Stochastic Operator Cocycles by the   Semigroup Method
  A new method for the construction of Fock-adapted operator Markovian cocycles is outlined, and its use is illustrated by application to a number of examples arising in physics and probability. The construction uses the Trotter-Kato Theorem and a recent characterisation of such cocycles in terms of an associated family of contraction semigroups. 
J. Martin Lindsay, Stephen J. Wills