1. Dobrushin, R.L.: Theory of Probability and its Applications13, 197–224 (1968)
2. Gallavotti, G., Miracle-Solé, S.: Commun. math. Phys.7, 274–288 (1968)
3. Gruber, C., Merlini, D.: Physica67, 308–322 (1973)
4. Hewitt, E., Ross, K. A.: Abstract Harmonic Analysis II. Berlin-Heidelberg-New York: Springer 1970
5. Krein, M. G.: Ukrain. Mat. Z.1, 64–98 (1949);2, 10–59 (1950). English translation: Amer. Math. Soc. Transl. Ser. 2,34, 69–164 (1963)