1. L. Accardi,International School of Mathematical Physics, Camerino, 1974, p. 268.
2. L. Accardi and A. Frigerio, Proc. Royal Irish Acad.83A, 251 (1983).
3. L. Accardi and M. Ohya, J. Multivariate Analysis, to appear.
4. L. Accardi,An Outline of Quantum Probability, unpublished manuscript (1990).
5. L. Accardi,Foundations of Quantum Probability, to be published.