1. We will not intend to give an exhaustive bibliography here. References will be given only to those papers that are relevant for purposes of comparison.
2. See for instance, N.G. van Kampen, Topics in Statistical Mechanics and Biophysics. A memorial to Julius L. Jackson (American Institute of Physics, New York, 1976).
3. R.F. Fox, J. Math. Phys. 19 (1978) 1993; Supp. Prog. Theor. Phys. 64 (1978) 50.
4. J. Keizer, J. Chem. Phys. 63 (1975) 398.
5. R.F. Fox, J. Chem. Phys. 70 (1979) 4660.