1. Akcoglu, M.A.: A pointwise ergodic theorem forL
p spaces. Canad. J. Math.27, 1075–1082 (1975)
2. Lecture Notes Math.;E. Cairoli,1970
3. Chacon, R.V., Krengel, U.: Linear modulus of a linear operator. Proc. Am. Math. Soc.15, 553–559 (1964)
4. Chacon, R.V., Ornstein, D.S.: A general ergodic theorem. Ill. J. Math.4, 153–160 (1960)
5. Dellacherie, C., Meyer, P.A.: Probabilities and Potential B. Amsterdam: North-Holland 1982