[1] Halmos P. R.: Lectures on Ergodic Theory. Tokyo 1956. (Лeкцuu no эpгoдuчecкoй meopuu, Mocквa 1959.) MR 0097489 | Zbl 0073.09302

[2] Preisendorfer R. W., Roos B. W.: Recurrence-partitions of finite measure spaces with applications to ergodic theory. Trans. Amer. Math. Soc. 99 (1961), 91-101. MR 0121639 | Zbl 0109.27702

[3] Pиечaн Б.: Зaмeчaнue к teopeмe Пyanкape o вoзвpaщeнuu na бyлeвcкux кoльцax. Mat.-fyz. časop. 15 (1965), 116-125.

[4] Wright F. B.: The converse of the individual ergodic theorem. Proc. Amer. Math. Soc. II (1960), 415-420. MR 0117318 | Zbl 0097.26701