1. Conley, C.C. and Rejto, P.A., in C.H. Wilcox (ed.), Perturbation Theory and Its Applications in Quantum Mechanics, Wiley, 1966, p. 129.
2. DaviesE.B., Comm. Math. Phys. 33, 171 (1973).
3. DaviesE.B., J. Math. Phys. 15, 2036 (1974).
4. DaviesE.B., Markovian Master Equations. Comm. Math. Phys. 39, 91 (1974).
5. Davies, E.B., ?Markovian Master Equations II?, Preprint.