no. 1
Ergodic elements of ergodic actions
Compositio Mathematica, Tome 23 (1971) no. 1, pp. 115-122. 
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     author = {Pugh, Charles and Shub, Michael},
     title = {Ergodic elements of ergodic actions},
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     pages = {115--122},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {1},
     year = {1971},
     mrnumber = {283174},
     zbl = {0225.28009},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1971__23_1_115_0/}
}
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Pugh, Charles; Shub, Michael. Ergodic elements of ergodic actions. Compositio Mathematica, Tome 23 (1971) no. 1, pp. 115-122. http://archive.numdam.org/item/CM_1971__23_1_115_0/

Billingsley [1] Ergodic Theory and Information. John Wiley and Sons. New York, 1965, p. 17. | MR | Zbl

G.W. Mackey [2] Group representations and Applications. Lectures given at Oxford University, 1966-1967.

L. Pontrijagin [3] Topological Groups. Princeton University Press. | JFM

A. Weil [4] L'integration dans les Groupes Topologiques et ses applications. Hermann, Paris (1951). | JFM | Zbl